The lateral surface area of a frustum of a cone, if the area of its base is 16π cm2 and the diameter of the circular upper surface is 4 cm and slant height 6 cm, will be
Show answer & explanation
Correct answer: C
Explanation
The correct answer is Option 3 I .e.36π cm2
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According to the question, πR2 = 16π R2 = 16 R = √16 = 4 r = 4/2 = 2 Now the area of the frustum = π(R + r)l = π(4 + 2) × 6 = 36π cm2
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