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Surface Areas And Volumes

Question 5:

An oil funnel made of tin sheet consists of a 10 cm long cylindrical portion attached to a frustum of a cone. If the total height is 22 cm, diameter of the cylindrical portion is 8 cm and the diameter of the top of the funnel is 18 cm, find the area of the tin sheet required to make the funnel (see the given figure).

Answer:

Radius (r1) of upper circular end of frustum part

Radius (r2) of lower circular end of frustum part...

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