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Find the Lateral surface area of the frustum, if the slant height is 12 cm and having radii as 15cm and 35 cm.(a) 1984 cm^2(b) 1804 cm^2(c) 1984 cm^2(d) 1884 cm^2I had been asked this question in homework.Enquiry is from Surface Area & Volumes topic in division Surface Area and Volumes of Mathematics – Class 10

Answer»

The correct choice is (d) 1884 cm^2

To EXPLAIN I would say: s = 12 cm, R = 35 cm, r = 15 cm

Lateral Surface area of FRUSTUM = π(r + R)s

L = 3.14 × (15 + 35) × 12

= 1884 cm^2



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