1.
The total length of all the edges of a two dimensional shape
2.
A metric unit of length
3.
The perimeter of a circle
4.
The length from one side of a circle to the other, through the middle
5.
The length from the middle of a circle to the edge
6.
The ratio of the circumference to the diameter
7.
Used to determine the circumference of a circle
8.
Part of a circle, sometimes shaped like a slice of pizza
9.
Symbol used to represent an angle
