1.

Find the total surface area of a frustum whose slant height is 18 cm and having radii as 8 cm and 16 cm.(a) 2361.28 cm^2(b) 2205.6 cm^2(c) 1628.23 cm^2(d) 2604 cm^2This question was addressed to me in an interview for job.Question is taken from Surface Area & Volumes in division Surface Area and Volumes of Mathematics – Class 10

Answer»

Right OPTION is (a) 2361.28 cm^2

The best explanation: s = 18cm, R = 16 cm, r = 8 cm

Total SURFACE AREA of a cone = π(R + r)s + πR^2 + πr^2

= 3.14(16 + 8)18 + (3.14 × 256) + (3.14 × 64)

= 1356.48 + 803.84 + 200.96

= 2361.28 cm^2



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