Question
The lateral surface area of frustum of a right circular
cone, if the area of its base is and the diameter of circular upper surface is 4 cm and slant height 6 cm, will beSolution
r = 4/2 = 2 cm
Also, πR^2 = 16 π
⇒ R^2 = 16
⇒ R = 4
Heightof the frustum h = 6 cm
Lateral surfacea area of the frustum = π (R + r) × l
⇒ π (4 + 2) × 6
⇒ 6 × 6 × π
⇒ 36 π
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