Across
- 1. two angles of a triangle are equal.
- 4. uses the equation a^2+b^2=c^2.
- 6. a pair of opposite angles formed by intersecting lines.
- 8. the amount of space in a certain 3D object.
- 10. proportional sides and congruent angles.
- 11. An image or shape as it would be seen in a mirror.
- 12. outside.
- 14. a straight line joining two opposite corners.
- 15. all equal sides with four right angles.
- 16. having equal angles.
- 17. half of a circle.
- 19. "caves" in.
- 20. half of a sphere.
Down
- 2. another word for equal.
- 3. a line segment that joins a vertex to the mid-point of the side that is opposite to that vertex.
- 5. splits an angle in half.
- 7. a line that passes through two lines in the same plane at two distinct points.
- 9. the line segment connecting the midpoints of two sides of a triangle.
- 13. angle at the base.
- 18. having an outline or surface curved like the exterior of a circle or sphere.