# Definitions, Postulates and Theorems

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1 Definitions, s and s Name: Definitions Complementary Angles Two angles whose measures have a sum of 90 o Supplementary Angles Two angles whose measures have a sum of 180 o A statement that can be proven Vertical Angles Transversal Two angles formed by intersecting lines and facing in the opposite direction A line that intersects two lines in the same plane at different points Corresponding Pairs of angles formed by two lines and a angles transversal that make an F pattern Same-side interior Pairs of angles formed by two lines and a angles transversal that make a C pattern Alternate interior Pairs of angles formed by two lines and a angles transversal that make a Z pattern Congruent triangles Triangles in which corresponding parts (sides and angles) are equal in measure Similar triangles Angle bisector Segment bisector Legs of an isosceles triangle Base of an isosceles triangle Equiangular Perpendicular bisector Altitude Triangles in which corresponding angles are equal in measure and corresponding sides are in proportion (ratios equal) A ray that begins at the vertex of an angle and divides the angle into two angles of equal measure A ray, line or segment that divides a segment into two parts of equal measure The sides of equal measure in an isosceles triangle The third side of an isosceles triangle Having angles that are all equal in measure A line that bisects a segment and is perpendicular to it A segment from a vertex of a triangle perpendicular to the line containing the opposite side Page 1 of 11

2 Definitions, s and s Definitions Geometric mean The value of x in proportion a/x = x/b where a, b, and x are positive numbers (x is the geometric mean between a and b) Sine, sin For an acute angle of a right triangle, the ratio of the side opposite the angle to the measure of the hypotenuse. (opp/hyp) Cosine, cos For an acute angle of a right triangle the ratio of the side adjacent to the angle to the measure of the hypotenuse. (adj/hyp) Tangent, tan For an acute angle of a right triangle, the ratio of the side opposite to the angle to the measure of the side adjacent (opp/adj) Algebra s Addition Prop. Of equality If the same number is added to equal numbers, then the sums are equal Subtraction Prop. Of equality If the same number is subtracted from equal numbers, then the differences are equal Multiplication Prop. Of equality If equal numbers are multiplied by the same number, then the products are equal Division Prop. Of equality Reflexive Prop. Of equality Symmetric Property of Equality Substitution Prop. Of equality If equal numbers are divided by the same number, then the quotients are equal A number is equal to itself If a = b then b = a If values are equal, then one value may be substituted for the other. Transitive Property of Equality Distributive Property If a = b and b = c then a = c a(b + c) = ab + ac s Reflexive Property of A A Symmetric Property of If A B, then B A Transitive Property of If A B and B C then A C Page of 11

3 Definitions, s and s Angle s And s Angle Addition postulate For any angle, the measure of the whole is equal to the sum of the measures of its nonoverlapping parts Linear Pair If two angles form a linear pair, then they are supplementary. Congruent If two angles are supplements of the same supplements theorem Congruent complements theorem Right Angle Vertical Angles Angle Bisector Converse of the Angle Bisector angle, then they are congruent. If two angles are complements of the same angle, then they are congruent. All right angles are congruent. Vertical angles are equal in measure If two congruent angles are supplementary, then each is a right angle. If a point is on the bisector of an angle, then it is equidistant from the sides of the angle. If a point in the interior of an angle is equidistant from the sides of the angle, then it is on the bisector of the angle. Lines s And s Segment Addition postulate For any segment, the measure of the whole is equal to the sum of the measures of its non-overlapping parts Through any two points there is exactly one line Common Segments If two lines intersect, then they intersect at exactly one point. Given collinear points A,B,C and D arranged as shown, if AB CD then AC BC Corresponding Angles Converse of Corresponding Angles If two parallel lines are intersected by a transversal, then the corresponding angles are equal in measure If two lines are intersected by a transversal and corresponding angles are equal in measure, then the lines are parallel Page 3 of 11

4 Definitions, s and s Lines s And s Through a point not on a given line, there is one and only one line parallel to the given line Alternate Interior If two parallel lines are intersected by a Angles transversal, then alternate interior angles Alternate Exterior Angles Same-side Interior Angles Converse of Alternate Interior Angles Converse of Alternate Exterior Angles Converse of Same-side Interior Angles are equal in measure If two parallel lines are intersected by a transversal, then alternate exterior angles are equal in measure If two parallel lines are intersected by a transversal, then same-side interior angles are supplementary. If two lines are intersected by a transversal and alternate interior angles are equal in measure, then the lines are parallel If two lines are intersected by a transversal and alternate exterior angles are equal in measure, then the lines are parallel If two lines are intersected by a transversal and same-side interior angles are supplementary, then the lines are parallel If two intersecting lines form a linear pair of congruent angles, then the lines are perpendicular If two lines are perpendicular to the same transversal, then they are parallel Perpendicular Transversal Perpendicular Bisector Converse of the Perpendicular Bisector Parallel Lines Perpendicular Lines Two-Transversals Proportionality If a transversal is perpendicular to one of two parallel lines, then it is perpendicular to the other one. If a point is on the perpendicular bisector of a segment, then it is equidistant from the endpoints of the segment If a point is the same distance from both the endpoints of a segment, then it lies on the perpendicular bisector of the segment In a coordinate plane, two nonvertical lines are parallel IFF they have the same slope. In a coordinate plane, two nonvertical lines are perpendicular IFF the product of their slopes is -1. If three or more parallel lines intersect two transversals, then they divide the transversals proportionally. Page 4 of 11

5 Definitions, s and s Triangle s And s Angle-Angle (AA) Similarity If two angles of one triangle are equal in measure to two angles of another triangle, then the two triangles are similar Side-side-side (SSS) Similarity Side-angleside SAS) Similarity Third Angles Side-Angle- Side SAS Side-side-side SSS Angle-sideangle ASA Triangle Sum Exterior angle theorem Triangle Proportionality Converse of Triangle Proportionality If the three sides of one triangle are proportional to the three corresponding sides of another triangle, then the triangles are similar. If two sides of one triangle are proportional to two sides of another triangle and their included angles are congruent, then the triangles are similar. If two angles of one triangle are congruent to two angles of another triangle, then the third pair of angles are congruent If two sides and the included angle of one triangle are equal in measure to the corresponding sides and angle of another triangle, then the triangles are congruent. If three sides of one triangle are equal in measure to the corresponding sides of another triangle, then the triangles are congruent If two angles and the included side of one triangle are congruent to two angles and the included side of another triangle, then the triangles are congruent. The sum of the measure of the angles of a triangle is 180 o The acute angles of a right triangle are complementary. An exterior angle of a triangle is equal in measure to the sum of the measures of its two remote interior angles. If a line parallel to a side of a triangle intersects the other two sides, then it divides those sides proportionally. If a line divides two sides of a triangle proportionally, then it is parallel to the third side. Page 5 of 11

6 Definitions, s and s Triangle s And s Triangle Angle An angle bisector of a triangle divides the opposite Bisector sides into two segments whose lengths are proportional to the lengths of the other two sides. Angle-angleside AAS Hypotenuse- Leg HL Isosceles triangle theorem Converse of Isosceles triangle theorem Pythagorean theorem Geometric Means a Geometric Means b Circumcenter Incenter If two angles and a non-included side of one triangle are equal in measure to the corresponding angles and side of another triangle, then the triangles are congruent. If the hypotenuse and a leg of a right triangle are congruent to the hypotenuse and a leg of another right triangle, then the triangles are congruent. If two sides of a triangle are equal in measure, then the angles opposite those sides are equal in measure If two angles of a triangle are equal in measure, then the sides opposite those angles are equal in measure If a triangle is equilateral, then it is equiangular The measure of each angle of an equiangular triangle is 60 If a triangle is equiangular, then it is also equilateral If the altitude is drawn to the hypotenuse of a right triangle, then the two triangles formed are similar to the original triangle and to each other. In any right triangle, the square of the length of the hypotenuse is equal to the sum of the square of the lengths of the legs. The length of the altitude to the hypotenuse of a right triangle is the geometric mean of the lengths of the two segments of the hypotenuse. The length of a leg of a right triangle is the geometric mean of the lengths of the hypotenuse and the segment of the hypotenuse adjacent to that leg. The circumcenter of a triangle is equidistant from the vertices of the triangle. The incenter of a triangle is equidistant from the sides of the triangle. Page 6 of 11

7 Definitions, s and s Triangle s And s Centriod The centriod of a triangle is located /3 of the distance from each vertex to the midpoint of the Triangle Midsegment opposite side. A midsegment of a triangle is parallel to a side of triangle, and its length is half the length of that side. If two sides of a triangle are not congruent, then the larger angle is opposite the longer side. Triangle Inequality Hinge Converse of Hinge Converse of the Pythagorean Pythagorean Inequalities Triangle If two angles of a triangle are not congruent, then the longer side is opposite the larger angle. The sum of any two side lengths of a triangle is greater than the third side length. If two sides of one triangle are congruent to two sides of another triangle and the third sides are not congruent, then the longer third side is across from the larger included angle. If two sides of one triangle are congruent to two sides of another triangle and the third sides are not congruent, then the larger included angle is across from the longer third side. If the sum of the squares of the lengths of two sides of a triangle is equal to the square of the length of the third side, then the triangle is a right triangle. In ABC, c is the length of the longest side. If c² > a² + b², then ABC is an obtuse triangle. If c² < a² + b², then ABC is acute. In a triangle, both legs are congruent, and the length of the hypotenuse is the length of a length times the square root of In a triangle, the length of the Triangle hypotenuse is times the length of the shorter leg, and the length of the longer leg is the length of the shorter leg times the square root of 3. Law of Sines For any triangle ABC with side lengths a, b, and c, sin A sin B sin C Law of Cosines a b c For any triangle, ABC with sides a, b, and c, a b c bc cos A, b a c ac cos B, c a b ac cosc Page 7 of 11

9 Definitions, s and s Polygon s And s If a parallelogram is a rhombus then its diagonals are perpendicular. Trapezoid Midsegment If a parallelogram is a rhombus, then each diagonal bisects a pair of opposite angles. If one angle of a parallelogram is a right angle, then the parallelogram is a rectangle. If the diagonals of a parallelogram are congruent, then the parallelogram is a rectangle. If one pair of consecutive sides of a parallelogram are congruent, then the parallelogram is a rhombus. If the diagonals of a parallelogram are perpendicular, then the parallelogram is a rhombus. If one diagonal of a parallelogram bisects a pair of opposite angles, then the parallelogram is a rhombus. If a quadrilateral is a kite then its diagonals are perpendicular. If a quadrilateral is a kite then exactly one pair of opposite angles are congruent. If a quadrilateral is an isosceles trapezoid, then each pair of base angles are congruent. If a trapezoid has one pair of congruent base angles, then the trapezoid is isosceles. A trapezoid is isosceles if and only if its diagonals are congruent. The midsegment of a trapezoid is parallel to each base, and its length is one half the sum of the lengths of the bases. Page 9 of 11

10 Definitions, s and s Polygon s And s Proportional Perimeters and a If the similarity ratio of two similar figures is, b Areas a then the ratio of their perimeter is and the b Area Addition a a ratio of their areas is or b b The area of a region is equal to the sum of the areas of its nonoverlapping parts. Circle s And s If a line is tangent to a circle, then it is perpendicular to the radius drawn to the point of tangency. If a line is perpendicular to a radius of a circle at a point on the circle, then the line is tangent to the circle. If two segments are tangent to a circle from the same external point then the segments are congruent. Arc Addition The measure of an arc formed by two adjacent arcs is the sum of the measures of the two arcs. In a circle or congruent circles: congruent central angles have congruent chords, congruent chords have congruent arcs and congruent acrs have congruent central angles. In a circle, if a radius (or diameter) is perpendicular to a chord, then it bisects the chord and its arc. Inscribed Angle In a circle, the perpendicular bisector of a chord is a radius (or diameter). The measure of an inscribed angle is half the measure of its intercepted arc. If inscribed angles of a circle intercept the same arc or are subtended by the same chord or arc, then the angles are congruent An inscribed angle subtends a semicircle IFF the angle is a right angle If a quadrilateral is inscribed in a circle, then its opposite angles are supplementary. Page 10 of 11

11 Definitions, s and s Circle s And s If a tangent and a secant (or chord) intersect on a circle at the point of tangency, then the measure of the angle formed is half the measure of its intercepted arc. If two secants or chords intersect in the interior of a circle, then the measure of each angle formed is half the sum of the measures of the intercepted arcs. If a tangent and a secant, two tangents or two secants intersect in the exterior of a circle, then the measure of the angle formed is half the difference of the measure of its intercepted arc. Chord-Chord If two chords intersect in the interior of a circle, Product then the products of the lengths of the segments of the chords are equal. Secant- Secant Product Secant- Tangent Product Equation of a Circle If two secants intersect in the exterior of a circle, then the product of the lengths of one secant segment and its external segment equals the product of the lengths of the other secant segment and its external segment. If a secant and a tangent intersect in the exterior of a circle, then the product of the lengths of the secant segment and its external segment equals the length of the tangent segment squared. The equal of a circle with center (h, k) and radius r is (x h) Other Page 11 of 11

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