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What is the exact area of a circle having diameter 4in
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What is the exact area of a circle having diameter 4in

User Xiaofei
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The diameter of a circle is calculated by using the formula D=r2pi so plug in the known values to find r=2/pi. Next plug r into the area of a circle formula(A=r^2pi) do so and get 4/pi
User Douglas Drouillard
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