19.63 square inches.
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Radius = Diameter/2. So in this case, radius = 8in/2 = 4 in
The area of a circle can be found with the formula (pi)r2. Since r = d/2, r would be 8in in this case. A = 64pi in2, or 201.1in2
50.26 cm2
The area of a circle with a diameter of 9.4 m is: 69.4 m2
If the area of a circle is 8pi, its diameter is: 5.657 units.