51.The diameter of the roller is 84 cm and its length is 120 cm. It takes 500 complete revolutions to move once over to level a playground. Find the area of the playground in square metres.
102 Views
52.The height of a right circular cylinder is 15 cm. Its curved surface area is 660 cm2. Find the radius of its base.
406 Views
53.A right circular cylinder is 3 m high and the circumference of its base is 22 m. Find its curved surface area.
148 Views
54.The diameter of a circular wall is 4.5 m and its depth is 14 m. Find the cost of cementing the in ner surface of the wall at र 120 per sq. m.
A metal pipe is 77 cm long. The inner diameter of a cross-section is 4 cm and outer diameter is 5.0 cm. Find its
(i) Inner curved surface area (ii) Outer curved surface area
Solution not provided.
Ans. (i) 968 cm2 (ii) 1210 cm2
98 Views
Advertisement
56.A cylinder 6 m high, is open at the top. The circumference of its base is 22 m. Find its total surface area.
102 Views
57.A solid cylinder has a total surface area 462 cm2. Its curved surface area is one-third of the total surface area. Find the height of the cylinder.
219 Views
58.A heap of rice is in the form of a cone whose diameter is 48 m and height 10 m. The heap is to be covered by canvas to protect it from rain. Find the cost of canvas required at र 70/m2.
283 Views
Advertisement
59.
Diameter of the base of a cone is 10.5 cm and its slant height is 10 cm. Find its curved surface area.
171 Views
60.
Find the total surface area of a cone, if its slant height is 21 m and diameter of its base is 24 m.
Short Answer Type
Switch
