Volume And Surface Area
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21 Find the surface area of a cuboid 10 m long, 5 m broad and 3 m high:
22 If radius and height of a cylinder increase by 20% and15% respectively. then what is the % change in curved surface area?
23 The volume of a cuboid is 1989 cm , while it's length and breadth are 17 cm and 13 cm, respectively. Find the height of the cuboid:
24 Two cones have their heights in the ratio 1:3 and the radii of their bases in the ratio 3:1. Find the ratio of their volumes:
25 The slant height of a right circular cone is 10 m and it's height is 8 m. Find the area of it's curved surface
26 Internal length, breadth and height of a rectangular box are 10 cm, 8 cm and 6 cm, respectively. How many boxes are needed which can be packed in a cube whose volume is 6240 cu. cm.?
27 The size of the wooden block is 5×10×20 cm .How many such blocks will be required to construct a solid wooden cube of minimum size?
28 In a shower, 5 cm of rain falls. The volume of water that falls on 1.5 hectares of ground is:
