172.The difference between outside and inside surface of a cylindrical metallic pipe 14 cm long is 44 cm2. If the pipe is made of 99 cm3Â of metal, find the outer and inner radii of the pipe.
Let the outer and inner radii of the pipe be R cm and r cm respectively. Then,
      Â
   and,  Â
Solving (1) and (2), we get
     Â
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173.Rain water which falls on a flat rectangular surface of length 6 cm and breadth 4 m is transferred into a cylindrical vessel of internal radius 20 cm. What will be the height of water in the cylindrical vessel if the rain fall is 1 cm? Give your answer to the nearest whole number. (Use  = 3.14)
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174.The pillars of a temple are cylindrically shaped. If each pillar has a circular base of radius 20 cm and height 10 m, how much concrete mixture would be required to build 14 such pillars?
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175.t a Ramzan Mela, a stall keeper is one of the food stalls has a large cylindrical vessel of base radius 15 cm filled up to a height of 32 cm with orange juice. The juice is filled in small cylindrical glasses of radius 3 cm up to a height of 8 cm, and sold for र 3 each. How much money does the stall keeper receive by selling the juice completel?
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176.
The volume of a right circular cylinder is 1100 cm3 and the radius of its base is 5 m. Find its curved surface area.
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177.The volume of a cylinder is 448Ï€ cubic cm and the height is 7 cm. Find its total surface area.
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178.The outer and inner radii of a hollow copper cylinder of height 6 cm are 11 cm and 10 cm. Find the volume of the copper used.
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179.
Volume of a right circular cylinder is 1100 cm3Â and the radius of its base is 5 cm. Find its curved surface area. Â
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180.The radii of two cylinders are in the ratio of 2 : 3 and their heights are in the ratio of 5 : 3. Find the ratio of their volumes
Short Answer Type
   
 = 3.14)
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