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Surface Areas And Volumes

Question 3:

A fez, the cap used by the Turks, is shaped like the frustum of a cone (see the figure given below). 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 use for making it.

Answer:

Radius (r2) at upper circular end = 4 cm

Radius (r1) at lower circular end = 10 cm

Slant height (...

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