Circle:
radius
diameter
Circumference: C =__________
Area: A = _____________
A circle has a radius, which is the distance from the center of the circle to any point on the circle's edge.
The diameter of a circle is the distance across the circle through its center point, and is equal to twice the radius.
The circumference of a circle is the distance around the circle's edge.
The formula to calculate the circumference of a circle is C= 2*pi*r where r is the radius of the circle and pi is approximately equal to 3.14.
The formula to calculate the area of a circle is A= pi*r^2, where r is the radius of the circle and pi is approximately equal to 3.14.