Question

the daimeter of the end of furstum of a cone are 32 cm and 20 cm . if slant height is 10 cm .find the lateral surface area

Answer 1

Hiii.......

Lateral surface area of frustrum =
$\pi \: l \: < {r1}^{2} \: \: + \: {r2}^{2} \: + \: r1r2 >$

=> 22/7 × 10 × ( 1024 + 400 + 640)

=> 220/7 × 2064

=> 64,868.571 cm^2.............ANS

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