Across
- 4. Quadrilateral with equal angles and sides.
- 8. Its perimeter is equal six times the length of its side.
- 9. Its area is half of the product of its diagonals.
- 10. Its area is length times width (l*w).
- 11. Polygon with five sides.
Down
- 1. It has no sides or angles, and its perimeter and area are related to the number pi.
- 2. Triangle with equal sides and angles.
- 3. Type of triangle with one right angle.
- 5. Triangle with two equal sides and a different one.
- 6. The 'STOP' traffic signal has this shape.
- 7. The most irregular of the quadrilaterals.