# A fez, the headgear cap used by the trucks is shaped like the frustum of a cone. If its radius on the open side is 12 cm and radius at the upper base is 5 cm and its slant height is 15 cm, find the area of material used for making it. (π = 3.14)

Given.

Radii of frustum are 12 cm and 5 cm

Slant height is 15 cm

Formula used/Theory.

CSA of frustum is π[R + r] × l

Area of material = CSA of frustum

= π[R + r] × l

= 3.14[12cm + 5cm] × 15cm

= 3.14 × 17cm × 15cm

= 800.7 cm2

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