Area of a circle = pi*radius2
Area = pi*212 = 1385.44236 square units
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A circle with a radius of 21 yards has an area of 1,385.44 square yards.
1,385.4 square cm
Area = pi*42 = 50.265 feet to 3 d.p.
Area in square meters = pi*42
Area = 1/4*Pi*d21/4*3.14*42 = about 12.56cm2