Well, area of a circle is (pi)r^2 and your diameter is 13, so your radius is 13/2
so your area would be (pi)(13/2)^2 or 132.7322896
=]
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The area of a circle with a diameter of 13 centimeters is: 132.7 cm2
The area of a circle with a 13 ft diameter is: 132.7 square feet.
132.73 yards2
The diameter of any circle is twice its radius. A circle with a radius of 13 inches will have 2 x 13 = 26 inches for a diameter.
The area of a circle with a diameter of 9.4 m is: 69.4 m2