Example 7.13 The slant height of a frustum of a cone is 5 cm and the radii of it's ends are 4cm and 1cm. Find its curved surface area.
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Answer:
330/7 cm² or 47 1/7 cm².
Step-by-step explanation:
Slant height of the frustrum of a cone ( l ) = 5 cm
Radius of one end of the frustrum of a cone ( r ) = 4 cm
Radius of other end of the frustrum of a cone ( r' ) = 1 cm
CSA of the frustrum of a cone = πl( r - r')
= 22/7 × 5 × ( 4 - 1)
= 22 × 5 × 3 / 7
= 330/7 cm²
Therefore the CSA of frustrum of a cone is 330/7 cm².
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