Area of a circle = piRsquared = 3.14 x 80 squared = 20,096 square meters.
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Circumference of a circle = π × diameter = π × 80 mm = 80π mm ≈ 251 mm
if width is equal to W and length is equal to L, then W x L = 80 L = W +2 so W x (W+2) = 80 solve to find W=8 and L= 10
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A square with an area of 400 square units has a perimeter of 80 units.
A=400 s=20