Geometry Vocabulary Polygon a closed figure/shape that is made up of at least 3 line segments Examples: Triangle, Quadrilateral, Pentagon, Hexagon, Heptagon, Octagon... Non-examples: Regular Polygon ny polygon that has equal sides and equal angles Examples: Equilateral Triangle, Square, Equilateral Pentagon Irregular Polygon ny polygon that does not have equal sides and equal angles Examples: Scalene Triangle, Trapezoid, rrow ongruent Same size, same shape Similar Same shape, different size Line Symmetry figure/shape has line symmetry when it can be separated it into two or more equal parts
Vertex The points on any figure Face The flat part of a 3-D object Edge The line segment where two faces meet on a 3-D object Triangles 3 side polygons, angles add up to 180 Examples: Right cute Obtuse Equilateral NO NO Isosceles Scalene
Quadrilateral 4 sided polygon, angles add up to 360 Examples: Picture Definition reaking It part Square 4 congruent sides 4-90 angles 4 lines of symmetry Rectangle 2 sets of congruent parallel sides 4-90 angles 2 lines of symmetry Rhombus 4 congruent sides opposite sides are parallel Opposite angles are = 2 lines of symmetry 2 Isosceles Triangles 2 Equilateral Triangles Parallelogram Trapezoid 2 sets of parallel sides opposite sides and angels are congruent Symmetry depends on the shape of the parallelogram Regular Trapezoid 1 set of parallel lines 1 line of symmetry Right Trapezoid 1 set of parallel lines 1 90 angle No Lines of Symmetry 2 Lines of Symmetry Split a trapezoid and you get 2 right trapezoids Kite 2 pairs of sides djacent sides are equal in length 1 line of symmetry Side 1 Side 2
Quadrilateral Hierarchy Diagram Types of Quadrilaterals: kites, trapezoids, parallelograms Types of Parallelograms: regular parallelograms, rhombi, rectangles, & squares kite trapezoid rhombus parallelogram square rectangle Types of Rhombi: regular rhombi & squares quadrilateral Types of Rectangles: regular rectangles & squares Pentagon 5 sided polygon, 5 angles regular irregular Hexagon 6 sided polygon, 6 angles regular irregular Octagon 8 sided polygon, 8 angles regular irregular
Definition Draw Write Say Plane a flat surface that extents in all directions Point an exact location, represented by a dot Line Segment - a line that stops on both ends Ray a ray has an ending point on one side and extends for infinity on the other end Line a straight path that goes for infinity in both directions Intersecting Lines lines that cross, opposite angles are equal Plane,, Plane,, Point, Point, Point intersects D Line Segment Ray Line Line Intersects Line D Perpendicular Lines lines that perfectly cross at 90 angles Line Is Perpendicular To Line D D D Parallel Lines lines that never cross D D Line Is Parallel To Line GH
Obtuse ngles - angles that are more than 90 but less than 180 Right ngles - angles that are exactly 90 cute ngles - angles that are less than 90 Straight ngles - angles that are exactly 180 omplementary ngles angles that add up to 90 Supplementary ngles angles that add up to 180 isect to divide with a line D
Interior inside Exterior outside What is the sum of the interior angles of the figure below? 720 900 1080 D 540 Parallelogram Which line segments are perpendicular? Which line segments form right angles? What type of triangles are beside the parallelogram? Which line segments are parallel?
rea all of the space on the inside of a figure or shape Note: rea = Length x Width 3 cm. 8 cm. 3 x 8 = 24 cm² Perimeter the rim or outside edges of a figure or shape Note: Perimeter = Length + Length + width + width or 2L + 2W = P 8 cm. 3 cm. 8 cm. 8 + 8 + 3 + 3 = 22 cm. or 16 + 6 = 22 3 cm. 3 cm. 8 cm. Which rectangle below has a perimeter of 35 centimeters and an area of 66 square centimeters? Work the problem by labeling a rectangle for each answer choice. 11.5 by 12 11 by 6 5.5 by 12 D 14 by 7 Solve the area and perimeter for each answer choice. Which answer choice is correct?