[" High Sehool Mathematics "1209],[" An oil funnel made of tin sheet consists of a "10cm],[" long eylindrical portion attached to a frustum of a "],[" cone.If total height is "22cm" ,diameter of the "],[" eylinderieal portion is "8cm" and the diameter of "],[" top of the funnel is "18cm" .Find area of the tin "],[" aheet required to make the funnel."]