0.0494
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First you have to divide the perimeter by 4, then square the solution. 81/4=20.25 20.25*20.25=410.0625 So the area equals 410.0625
81/2= 40.5
81/24=3.375
40.0617
81 Divide by three. 27,3 Divide by three. 9,3,3 Divide by three. 3,3,3,3 Stop.