Area = 1/4*Pi*d2 = 0.25*3.14*282 = about 615.75cm2
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A circle with a diameter of 8.5 cm has an area of 56.75 square cm
The area of circle that has a diameter of 6.5 cm is: 33.18 cm2
The area of a circle that has diameter of 3 cm is: 7.069 cm2
For a circle with a diameter of 100 cm, the area is ≈ 9,503.32 cm2
Area of a circle in square cm = pi*radius2