1.

The frustum of a cone has its circular ends radius as 5 cm and 15 cm where the height is given as 8 cm. Find the volume of the frustum.(a) 2152.76 cm^3(b) 1254 cm^3(c) 2721.33 cm^3(d) 1421.76 cm^3This question was addressed to me in unit test.Question is from Surface Area & Volumes in chapter Surface Area and Volumes of Mathematics – Class 10

Answer»

The correct choice is (c) 2721.33 cm^3

The best I can explain: R = 5 cm, R = 15 cm and h = 8 cm

The volume of a Frustum = \(\FRAC {1}{3}\) πh(r^2 + rR + r^2)

= \(\frac {1}{3}\) × 3.14 × 8(25 + 75 + 225)

= 2721.33 cm^3



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