Geometry

5. right triangle with a 90 degree angle and all sides of different length
7. a quadrilateral with four right angles
8. a portion of the area, like the area of a piece of pie
12. a quadrilateral with all sides of equal lengths
13. a five-sided polygon with all sides of equal length and all angles of equal measure
15. the length of the edge of the circle, like finding the length of the crust on a piece of pie.
16. triangle with all sides of equal length
17. amount of space a 3D object takes up
18. a quadrilateral with two pairs of consecutive, equal sides
19. middle of circle to outer edge of circle

1. the same
2. length around a circle
3. a quadrilateral with one pair of parallel sides
4. the set of points equidistant from a central point
6. amount of space in a 2D shape
9. angles that add up to 90 degrees
10. a quadrilateral with two pairs of parallel sides.
11. a quadrilateral with four right angles and four right sides of equal length.
13. a2+b2=c2
14. a polygon with four sides
20. an arc with endpoints on each side of the angle