The formula for the area of a circle is:
The radius is the distance from the center of the circle to the edge:
In this problem we have been given the diameter of the circle. The diameter is the distance from one edge of the circle to the opposite edge:
The diameter of a circle is always twice as long as the radius
In this problem, the diameter of the circle is
To find the area of the circle, square the radius:
Now multiply by . The number is approximately equal to 3.14.