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An oil funnel of tin sheet consists of a cylindrical portion 10 cm long attached to a frustum of a cone.

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

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Slant height of the frustum

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