After cutting a round piece of paper, put it together into an approximate rectangle with the width equal to the radius and the area equal. The circumference of the rectangle is 16.56 cm, which is cut What is the area of the round paper

After cutting a round piece of paper, put it together into an approximate rectangle with the width equal to the radius and the area equal. The circumference of the rectangle is 16.56 cm, which is cut What is the area of the round paper

After cutting, the radius of the circle is the width of the rectangle, and the perimeter is the two lengths of the rectangle
therefore
3.14×2×R+2R=16.56
8.28R=16.56
R=2
The area of circular paper is 3.14 × R × r = 12.56 square centimeter
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