Question

Find the difference between the radii of a Frustum, if the slant height and height are 10 cm and 8 cm.

(a) 4 cm

(b) 1 cm

(c) 2 cm

(d) 6 cm

I have been asked this question in homework.

The query is from Surface Area & Volumes topic in section Surface Area and Volumes of Mathematics – Class 10

Answer 1

Correct choice is (d) 6 cm

Easiest explanation: The slant height of a cone = h^2 + (R – r)^2

10^2 = 8^2 + (R – r)^2

(R – r)^2 = 100 – 64

(R – r) = 6 cm