Скачать или смотреть Cbse X Math Chp 12 Surface Areas and Volumes - part 4

1:37 A tent is in the shape of a cylinder surmounted by a conical top. If the height and diameter of the cylindrical part are 2.1m and 4m respectively, and the slant height of the top is 2.8m, find the area of the canvas used for making the tent. Also, find the cost of the canvas of the tent at the rate of Rs 500 per m². (Note that the base of the tent will not be covered with canvas).
6:26 From a solid cylinder whose height is 2.4cm and diameter 1.4cm, a conical cavity of the same height and same diameter is hollowed out. Find the total surface area of the remaining solid to the nearest cm².
10:22 A wooden article was made by scooping out a hemisphere from each end of a solid cylinder, as shown in figure. If the height of the cylinder is 10cm, and its base is of radius 3.5cm, find the total surface area of the article.
14:18 Rohan runs an industry in a shed which is in the shape of a cuboid surmounted by a half cylinder as shown in figure. If the base of the shed is of dimension 7m x 15m, and the height of the cuboidal portion is 8m, find the volume of air that the shed can hold. Further, suppose the machinery in the shed occupies a total space of 300m³, and there are 20 workers, each of whom occupy about 0.08m³ space on an average. Then, how much air is in the shed?.



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