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Find the Lateral surface area of the frustum, if the slant height is 15cm and having radii as 14 cm and 21 cm.

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in Mathematics - Class 10 by (506k points)
Find the Lateral surface area of the frustum, if the slant height is 15cm and having radii as 14 cm and 21 cm.

(a) 1648.5 cm^2

(b) 1115 cm^2

(c) 2105.4 cm^2

(d) 1237.2 cm^2

The question was posed to me in examination.

I'm obligated to ask this question of Surface Area & Volumes in portion Surface Area and Volumes of Mathematics – Class 10

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Right answer is (a) 1648.5 cm^2

The best explanation: s = 15 cm, R = 42 cm, r = 28 cm

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

L = 3.14(21 + 14 )15

= 1648.5 cm^2

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