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Find the total surface area of a frustum whose slant height is 18 cm and having radii as 8 cm and 16 cm.

Find the total surface area of a frustum whose slant height is 18 cm and having radii as 8 cm and 16 cm. Correct Answer 2361.28 cm2

s = 18cm, R = 16 cm, r = 8 cm Total surface area of a cone = π(R + r)s + πR2 + πr2 = 3.14(16 + 8)18 + (3.14 × 256) + (3.14 × 64) = 1356.48 + 803.84 + 200.96 = 2361.28 cm2

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