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Lateral surface area of the frustum of a cone whose smaller radius is \\[{{r}_{2}}\\] and larger radius is \\[{{r}_{1}}\\] is\n \n \n \n \n (a) \\[\\pi \\left( {{r}_{2}}-{{r}_{1}} \\right)h\\](b) \\[\\pi \\left( {{r}_{2}}+{{r}_{1}} \\
How would you find the volume of a frustum if you only had the heights and the radius of the bigger cone? - Quora