Geometry Crossword

4. the point of concurrency of the angle bisectors of a triangle
6. the point that divides a segment into two congruent segments
8. a rule that is accepted without proof
10. the intersection of a plan and a sphere such that the plan contains the center of the sphere
13. the statement formed by negating both the hypothesis and conclusion of the converse of a conditional statement
14. an arc with a measure less than 180°
15. the set of all points in a plane that are equidistant from a given point

1. a line that is perpendicular to a segment at its midpoint
2. the original figure before a transformation
3. a two dimensional representation of the faces of a polyhedron
5. a logical argument that uses deductive reasoning to show that a statement is true
7. the sum of the areas of the lateral faces of a polyhedron
9. a quadrilateral with exactly one pair of parallel sides
11. a set of points consisting of two different rays that have the same endpoint
12. the point of concurrency of three perpendicular bisectors of a triangle