Window glass formerly was made by gathering a lump of molten glass on the end of a hollow rod blowing it into the form of a large hollow cylinder about 6 ft. long and 1 1/2 ft. in diameter. This was cut longitudinally and then placed in an oven and heated until it softened, when it was flattened out into plates and cut into the desired sizes. If this plate was 0.12 in. thick, find the amount of glass in the original lump.
the answer is 0.28274 cu. ft. but i need the computation on how to get that answer, thank you! it will help me a lot.
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