Across
- 2. A triangle with at least two congruent sides
- 4. A triangle with three acute angles
- 6. angle. An angle formed by two sides of a triangle
- 7. A triangle with no congruent sides
- 9. points. The set of all points outside a figure
- 10. A triangle with one obtuse angle
- 12. points. The set of all points inside a figure
- 13. angle. An angle formed by one side of a triangle and the extension of an adjacent side
Down
- 1. interior angle. An interior angle that is not adjacent to the exterior angle.
- 3. A triangle with three congruent sides
- 5. A theorem whose proof follows directly from another theorem
- 8. A triangle with three congruent acute angles
- 11. A triangle with one right triangle