Across
- 4. a triangle with three acute angles
- 6. a quadrilateral with four right angles
- 10. a triangle with one obtuse angle
- 12. a polygon with congruent sides and angles
- 15. a quadrilateral with two pairs of parallel sides
- 17. a triangle with two congruent sides
Down
- 1. a rectangle with congruent sides
- 2. a triangle with one right angle
- 3. a four-sided polygon
- 5. a quadrilateral with one pair of parallel sides
- 7. figures that are the same size and shape
- 8. The amount of three-dimensional space inside of an object
- 9. A closed two-dimensional shape made of straight lines
- 11. a triangle with three congruent sides
- 13. The amount of two-dimensional space inside of a shape
- 14. a quadrilateral with 4 congruent sides
- 16. a triangle with sides that are all different sizes