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  3. (b) A triangle PQR, where PQ = 9 cm, QR = 12 cm and PR = 15 cm, is rotate about the side QR totrace out a cone. Find the volume and the total surface area of the cone.?
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(b) A triangle PQR, where PQ = 9 cm, QR = 12 cm and PR = 15 cm, is rotate about the side QR totrace out a cone. Find the volume and the total surface area of the cone.?

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