Across
- 2. area of a circle is pi times the radius squared
- 5. surface planes of three-dimensional shapes
- 6. two lines that connect to make a corner
- 7. "father of trigonometry?
- 8. point at which two sides of a two-dimensional figure
Down
- 1. longest side of a right-angled triangle
- 3. "father of geometry"
- 4. identical in size and shape