Geometry Vocabulary polygon a closed figure formed by

Geometry Vocabulary

• polygon- a closed figure formed by 3 or more line segments • quadrilateral- polygon with 4 sides and 4 angles • rhombus- a parallelogram with 4 congruent sides • rectangle- a parallelogram with 4 right angles • square- a polygon with 4 equal sides • trapezoid- a quadrilateral with exactly one pair of parallel sides • hierarchy- a system for organizing things • attribute-a characteristic of a shape

• triangle- polygon with 3 sides and 3 angles • right triangle- triangle with one 90 degree angle • acute triangle- triangle with 3 angles measuring less than 90 degrees • obtuse triangle- triangle with one angle greater than 90 degrees • equilateral triangle- all 3 sides are congruent (equal) • scalene triangle- no sides are congruent (equal) • isosceles triangle- 2 sides are congruent (equal)

• regular polygon- all sides and angles are congruent • irregular polygon- not all sides and angles are congruent • pentagon- a polygon with 5 sides • hexagon- a polygon with 6 sides • heptagon- a polygon with 7 sides • octagon- a polygon with 8 sides • nonagon- a polygon with 9 sides • decagon- a polygon with 10 sides • circle- a closed figure with all points on the figure the same distance from the center point

20 Sided Polygon- Icosagon

Review Vocabulary • two dimensional-shape that only has two dimensions (such as width and height) and no thickness • parallel- lines that do not intersect • perpendicular- 2 lines that intersect to form right angles • congruent- having the same size and shape • right angle- an angle that measures 90 degrees