Geometry Puzzle

2. two pairs of adjacent congruent sides
3. four equal sides
9. if x=y, then y can be substituted in for x in any expression
10. two-dimensional closed figure made up of straight-line segments connected end-to-end
11. four equal sides and four right angles
13. an angle in a circle with its vertex on the circle
15. means to divide into two equal parts
17. an angle in a circle with its vertex on the circle
18. set of points a fixed distance from a center and is defined by a central angle
20. line that is perpendicular to the circle's radius

1. formed by two radii of a central angle and the arc between their endpoints on the circle
4. a segment that connects the midpoints of any two sides of a triangle
5. Any two points on a circle. Usually referred to as the larger of two
6. a line segment that has both endpoints on a circle
7. a point that divides a line segment into two parts of equal length
8. both pairs of opposite sides are parallel
12. property if x=y and y=z then x=z
14. four right angles
16. property the measure of any side or angle is equal to itself
19. Any two points on a circle. Usually referred to as the smaller of two