Geometry Vocabulary. Polygon a closed figure/shape that is made up of at least 3 line segments

Transcription

1 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

2 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

3 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

4 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

5 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

6 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

7 Interior inside Exterior outside What is the sum of the interior angles of the figure below? 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?

8 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 = 22 cm. or = 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 by by by 12 D 14 by 7 Solve the area and perimeter for each answer choice. Which answer choice is correct?