xample 122 The radii of the ends of a frustumof a cone 45 cm high are 28 cm and 7 cmsee Fig. 13.21). Find its volume, the curvedsurface area and the total suface area28 cm45 cm(Take Ď=Solution : The frustum can be viewed as a dif-ference of two right circular cones OAB andOCD (see Fig. 13.21). Let the height (in cm)of the cone OAB be h, and its slant height,ie, OP = hi and OA = OB-11. Let h, be the

xample 122 The radii of the ends of a frustumof a cone 45 cm high are

1.	xample 122 The radii of the ends of a frustumof a cone 45 cm high are 28 cm and 7 cmsee Fig. 13.21). Find its volume, the curvedsurface area and the total suface area28 cm45 cm(Take Ď=Solution : The frustum can be viewed as a dif-ference of two right circular cones OAB andOCD (see Fig. 13.21). Let the height (in cm)of the cone OAB be h, and its slant height,ie, OP = hi and OA = OB-11. Let h, be the
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