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The formula to calculate cross sectional area of a cylinder is pi (a constant value, approximately 3.14) multiplied by the radius of the cylinder (half the diameter, so half the distance from on side of the circle to the other) squared (multiplied again by itself) So if the circular end of the cylinder is 10 centimeters across, then the diameter is 10cm and the radius is 5cm. The cross sectional area would be calculated as: 3.14 x 5cm x 5cm = 78.5cm squared.

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Q: How do you calculate the cross section area of cylinder?
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