The area of a circle is calculated from the formula Pi x r2 . A 1cm diameter circle has a radius of 0.5cm, thus it has an area of 0.785cm2
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A circle with a diameter of 8.5 cm has an area of 56.75 square cm
The area of a circle that has diameter of 3 cm is: 7.069 cm2
The area of circle that has a diameter of 6.5 cm is: 33.18 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