math crossword

3. a straight line from the center to the circumference of a circle or sphere.
5. half of a circle or of its circumference.
6. a straight line passing from side to side through the center of a body or figure, especially a circle or sphere.
8. circles circles with a common center.
11. line a straight line joining two points on a function.
12. angle is an angle with endpoints and located on a circle's circumference and vertex located at the circle's center.
13. any smooth curve joining two points.

1. angle an angle formed by two chords in a circle which have a common endpoint.
2. he enclosing boundary of a curved geometric figure, especially a circle.
4. the middle point of a circle or sphere, equidistant from every point on the circumference or surface.
7. 3.14159265359
9. line the tangent line to a plane curve at a given point is the straight line that "just touches" the curve at that point.
10. a ring-shaped object, structure, or region.
12. straight line segment whose endpoints both lie on the circle.