Denote the original area by A, denote the new area by A', denote the original circumference by C, and denote the new circumference by C'. C=2*pi*r so C'=2C=2*pi*(2r). So doubling the circumference corresponds to doubling the radius. A=pi*r2. A'/A=pi*(2r)2/[pi*r2]=4. So doubling the radius quadruples the area.
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It becomes twice as large
The area increase by four times.
The area quadruples.
If the circumference of a circle is 6.28 then its area is about 3.138 square units
The area of circle with a circumference of 20 is: 31.83 units squared.