pi x r squared
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Diameter = 12 cm so radius = 6 cm. Then area = pi*r2 = 36*pi = 113.1 cm2
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