To work out the area of a circle: Find the value of the radius. If the diameter is given, this must be halved. Substitute the value of the radius into the formula for the area of a circle.
r\) is the radius of the circular cross-section and ... Find the area of the cross-section using the formula for the area of a circle, \(A\) = Ï€\(r\)². Multiply by the height of the cylinder.
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