4.2 acres = 17,000 m2
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42 square feet
An area of a circle is pi*r2 - so an area of a semicircle is 0.5*pi*r2: 0.5*3.14*42 = 25.13 square meters
42 is not a square number but 42^1=42
Just over a third of an acre! Acre is 4840 sq yards x .37 = 1790.8 sq yds. Imagine a square 42 yards and a foot on each side.
it is, but the answer is a decimal.