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11. Mensuration
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Q13 of 45 Page 11

How many cubic metres of earth must be dug out to since a well is 16m deep and which has a radius of 3.5m? If the earth taken out is spread over a rectangular plot of dimensions what is the height of the platform so formed?

The volume of the earth dug out The area of the given plot The volume of the platform formed = the volume of the earth dug out The height of the platform The height of the platform = 1.54m.

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11 A field is 80m long and 50m broad. In one corner of the field, a pit which is 10m long, 7.5 m broad and 8m deep has been dug out. The earth taken out of it is evenly spread over the remaining part of the field. Find the rise in the level of the field. 12 Find the volume of a cylinder which is 18cm in height and radius 10.5 cm. 14 An iron pipe is 21cm long and its exterior diameter is 8cm. If the thickness of the pipe is 1cm and iron weighs 8g/cm3. Find the weight of the pipe. 15 A closed metallic cylindrical box is 1.25m high and it has a base whose radius is 35cm. If the sheet of metal costs Rs. 80 per m2. Find the cost of the material used in the box. Find the capacity of box in litres.
Questions · 45
11. Mensuration
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