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Find the slant height if the frustum of height 10cm and having its diameter as 20 cm and 40 cm.(a) 10.4 cm(b) 14.14 cm(c) 15.50 cm(d) 89.4 cmThis question was posed to me in class test.The above asked question is from Surface Area & Volumes topic in division Surface Area and Volumes of Mathematics – Class 10

Answer»

Correct option is (b) 14.14 CM

Best explanation: h = 10 cm, R = 20 cm, r = 10 cm

The SLANT HEIGHT of a cone s^2 = h^2 + (R – r)^2

s^2 = √(100 + (20 – 10)^2)

s = 14.14 cm



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