Across
- 4. two adjacent angles
- 6. 360° exactly
- 10. the sum of the three interior angles in a triangle adds up to 180°
- 13. angles that add up to 180°
- 14. corner of an angle
- 15. at least two congruent sides
- 17. two straight lines or rays meet at a common endpoint
- 18. 180° exactly
Down
- 1. angles that share a common vertex and side
- 2. angles opposite each other where two lines cross
- 3. the three angles on the inside of a triangle
- 5. less than 90°
- 7. exactly 90°
- 8. angles that add up to 90°
- 9. greater than 180°
- 11. created by extending one side of the triangle
- 12. two sides of the angle, joined at a common endpoint
- 16. more than 90°but less than 180°