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OpenStudy (anonymous):
a cone with radius 3cm has a total area 24pi cm^2. Find its height
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OpenStudy (anonymous):
clearly, the area of the base = 9pi cm^2 so, area of the slant surface=15 pi cm^2 area of slant surface= 1/2 * slant height* perimeter of base in this case, perimeter of base= 6 pi cm so, the slant height= 5 cm (after calculation) radius=3 cm so, height= 4 cm
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