Area of circle: pi times 2 squared = 4*pi square inches
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Area of a circle = pi times radius squared
1 inch
Area = pi * radius * radius radius = diameter / 2 radius = 16/2 = 8 Area = 64 * pi Area 201.062 inches2
2 inch radius = 12 9/16" circumference & an area of 12.56637 sq. inches.
Radius is 3 times as large so area is 3*3 = 9 times as large.