That will depend on whether the 64 inches is the
radius, diameter, or circumference of the circle.
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It is the formula to find the area of a circle.
Area = pi * radius * radius radius = diameter / 2 radius = 16/2 = 8 Area = 64 * pi Area 201.062 inches2
The area of a 7-inch circle is: 38.48 square inches.
The area of a 26-inch diameter circle is 530.93 square inches.
If the area of a circle is 64 square units the diameter is: 9.027 units.