The side length of a square is equal to the radius of a circle, and the area of a square is 5 square decimeters (hint: a = R, the square of a = R, the square of a)

If the area of a square is 5 square decimeters, the square of the side length R is 5
The area of the circle is TT (the square of R) = 5tt

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1. The radius of a circle is equal to the side length of a square. The area of a square is 3 square decimeters. The area of this circle is 3 square decimeters
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