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Rachel, an engineering student, was asked to make a model shaped like a cylinder with two cones attached at its two ends by using a thin aluminum sheet. The diameter of the model is 3 cm and its length is 12 cm. if each cone has a height of 2 cm, find the volume of air contained in the model that Rachel made. (Assume the

outer and inner dimensions of the model to be nearly the same.) [Use π = 22/7]

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From the figure, it can be observed that

Height (h1) of each conical part = 2 cm

Height (h2) of cylindrical part = 12 − 2 × Height of conical part = 12 − 2 ×2 = 8 cm

Radius (r) of cylindrical part = Radius of conical part = 3/2 cm

Volume of air present in the model = Volume of cylinder + 2 × Volume of cones


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