Area = pi*122 = 452.389 square cm to 3 dp
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The area is ~452.3 cm2
The area is pi*radius2 = 452 cm2, approx.
The area of a circle whose radius is 19 centimeters is: 1,134 cm2
A circle with a radius of 7.75 meters has an area of 188.69 square meters.
A circle with a radius of 21 cm has an area of ~1,385.44 square cm