u ustum.
3. A fez, the cap used by the Turks, is shaped like the
frustum of a cone (see Fig. 15.24). If its radius on the
open side is 10 cm, radius at the upper base is 4 cm
and its slant height is 15 cm, find the area of material
used for making it.
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Answer:
radius of open side =10
radius of upper base=4
l=15
surface area =π(10+4)15+π×4
22/7(10+4)×15+22/7(42)
660+352/7
4972/7=710cm(~)
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