Across
- 2. having four right angles
- 7. a triangle with one right angle
- 8. a three-sided regular polygon
- 9. an angle between 90 and 180 degrees
- 10. a four-sided polygon
- 11. the 90 degree angle between two perpendicular lines
- 12. being everywhere equidistant and not intersecting
- 13. a triangle with one right angle
Down
- 1. triangle that contains an obtuse interior angle
- 3. a triangle with two equal sides
- 4. a surface generated by rotating a line around a fixed line
- 5. a parallelogram with four equal sides
- 6. a triangle with no two sides of equal length
- 7. a closed plane figure bounded by straight sides
- 12. a quadrilateral whose opposite sides are parallel and equal