The circumference of a circle is 12.56 decimeters. Draw the largest square in a garden. The square area is listed
Let its radius be r, then R & # 178; = 12.56 △ 3.14 = 4 square decimeters
R = 2 decimeters
So the diameter is 2 × 2 = 4 decimeters
So the square area is: 4 × 4 △ 2 = 8 square decimeters
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