Across
- 2. The distance from the center of a circle to its edge.
- 6. What do you call the half of a circle?
- 7. The name of the U-shaped graph of a quadratic function.
- 9. The only even prime number.
- 10. The longest side of a triangle.
Down
- 1. The line that touches a circle at exactly one point.
- 3. What shape has 10 sides?
- 4. How many zeros are in one million?
- 5. Who developed the Cartesian coordinate system?
- 8. The number that has no positive or negative sign.