You can divide the diameter by two.
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2 times pi times radius
A = Pi(r)2: A circle with a radius of 8 cm has an area of 201.06 square cm.
Take "pi" times the diameter of the circle. Pi = 3.14159 (ALWAYS) If circle has a diameter of 10cm, circumference 31.41cm If circle has a radius of 2inches, the circumference is 12.57 inches. (radius = 2, diameter = 4)
The formula is (pi x radius to the power of 2), so its 3.14 x 82.6= figure it out
To find the area of the circle pi*radius*squared and subtract the area of the figure inside