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17 February, 15:41

In the derivation of the formula for volume of a sphere, we started with a cylinder with two cones inside. Imagine passing a horizontal plane through the figure, creating radius b, as shown below.

What is the cross-sectional area of the shaded ring?

πb2 - πr2, or π (b2 - r2)

πb2 + πr2, or π (b2 + r2)

πr2 - πb2, or π (r2 - b2)

πr2 + πb2, or 2π (r2 + b2)

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  1. 17 February, 15:44
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    C. πr2 - πb2, or π (r2 - b2)

    I know its right trust me.
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