Geometry terms

4. Three perpendicular bisectors of a triangle intersect in one point
7. Polygon is the sum of the lengths of its sides
9. bisector, A ray that divides an angle into two adjacent congruent angles
10. Known as the center of gravity of a triangle
12. ratio, A ratio of the sides of a right triangle
13. A sphere is a segment passing through the center of a sphere with endpoints on the sphere
14. Opposite divided by the adjacent
18. A quadrilateral with both pairs of opposite sides parallel
19. The set of all points in space equidistant from a given point
20. A statement that we prove

1. of concurrency, when three or more lines intersect at one point
2. Adjacent divided by hypotenuse
3. pair, Two adjacent angles form
5. triangle, A triangle with all angles equal
6. The noncolinear points in a triangle
8. A polygon with 4 sides
11. The perimeter of a plane figure is measured in
15. sector, A circle is a region bounded by an arc of the circle and the radii to the arc's endpoints
16. A sphere of a segment that has one endpoint at the center and the other endpoint on the sphere
17. A angles that share a common side and vertex