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i believe the equation is : 2 x pi x r

so if the radius is half the diameter, it will be 2 x pi x 2.5 = 15.7

2 x pi x r is the circumfrence.. pi x r2= A so 2.52 x pi=6.25pi or about 19.63

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Q: What is the area of a circle if the diameter is 5 cm?
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