Five marks exercise problems IX — task. Mathematics State Board, Class 10.

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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.

Answer:

The area of the tin sheet required to make the funnel

$=$

$cm^2$

[Note: Round off your answer up to two decimal places.]

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15. Five marks exercise problems IX