Across
- 1. An angle greater than 90 degrees but less than 180 degrees
- 6. A quadrilateral with both pairs of opposite sides parallel to each other
- 10. The sum of two angles equals 90 degrees
- 11. A parallelogram that has four right angles
- 12. A triangle with three unequal sides and angles
Down
- 2. The sum of two angles equals 180 degrees
- 3. A triangle with all sides and angles equal
- 4. Any polygon with four sides
- 5. A straight line passing through the center of a circle or sphere and meeting the circumference or surface at each end
- 7. An angle less than 90 degrees but greater than 0 degrees
- 8. A triangle that has two equal sides
- 9. A straight line extending from the center of a circle to the circumference or surface