1
the distance around the circle
2
the longest distance from one end of a circle to the other
3
a line perpendicular to the radius that touches only one point on the circle
4
a simple closed curve
5
A pie-shaped part of a circle
6
distance between the center to any point on a circle
7
a line that intersects a circle at two points
8
The size of a surface
9
a curved line that is part of the circumference of a circle
10
A number equal to (the circumference) / (the diameter) of any circle
