Across
- 2. to have the same shape and size
- 3. an angle within a shape that contains the base of the shape as one of its sides
- 4. a line segment which bisects another line segment at 90 degrees
- 9. a point on a line segment that divides it into two equal parts
- 12. are those that don't share a vertex or corner of a triangle with the exterior angle
- 15. a ray that divides an angle into two equal parts
Down
- 1. the sum of any two sides of a triangle is greater than the third side, and if the sum of any two sides of a triangle is not greater than the third side it means the triangle does not exist
- 5. is a property on congruence that shows that any geometric figure is congruent to itself
- 6. states that the vertical angles that are formed when two lines intersect are congruent
- 7. stands for "corresponding parts of congruent triangles are congruent"
- 8. an angle that is formed by two sides of a polygon, sharing a common vertex
- 10. the segment formed by connecting the midpoints of any two sides of a triangle
- 11. an unprovable rule or first principle accepted as true because it is self-evident or particularly useful
- 13. is the side connecting two angles
- 14. is the logical way in which mathematicians demonstrate that a statement is true