Circle Terms
Radius
Diameter
100

The line that extends from the center of the circle to the edge of the circle.

What is the radius

100

The diameter of this circle is 10

What is 5

100

The Radius of this circle is 4

What is 8

200

The longest line that stretches from edge to edge in a circle. Also twice the radius.

What is Diameter

200

The diameter of this circle is 24

What is 12

200

The Radius of this circle is 35

What is 70

300

The perimeter of a circle

What is the Circumference

300

The diameter of this circle is 15

What is 7.5

300

The Radius of this circle is 22.5

What is 45

400

The total amount of space a circle takes up

What is Area

400

The diameter of this circle is 26

What is 13

400

The Radius of this circle is 222

What is 444

500

The ratio C/D or 3.14 or approximately 22/7

What is Pi

500

The diameter of this circle is 2

What is 1?

500

The Radius of this circle is 33450

What is 66900?