Step 1: Measure the center point of the circle
Step 2: Draw a STRAIGHT line from the center point to the edge of circle (this can be anywhere)
Step 3: The length between the center point and the circle itself is your radius.
An easier way to measure this is measuring the length or width from your circle and divide it by 2.
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The area of a circle of radius 21 is 1386
The area of a circle with a radius of 14.4 is 651.4
Area of a circle = pi*radius squared
A circle with a radius of 135 units has an area of 57,255.53 square units.
If the area of a circle is 40.7 the radius is: about 3.6 (3.599)