Prove that the curved surface area of a sphere of radius r intercepted between two parallel planes at a distance a and b from the center of the sphere is 2Ï€r(b-a) and hence deduct the surface area of the sphere (b>a)
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Demi is working on a presentation about a famous mathematician for her math class. She decides to make her poster in the shape of a plus sign.
What is the total area of Demi's poster?
\text{in}^2in
2
i, n, start superscript, 2, end superscript
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