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Ex 13.2, 4 - The diameter of roller is 84 cm and its length - Area Of Cylinder

 

  1. Chapter 13 Class 9 Surface Areas and Volumes
  2. Serial order wise
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Ex 13.2, 4 The diameter of a 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 m2? [๐ด๐‘ ๐‘ ๐‘ข๐‘š๐‘’ ๐œ‹= 22/7] Roller is of form cylinder Radius = ๐ท๐‘–๐‘Ž๐‘š๐‘’๐‘ก๐‘’๐‘Ÿ/2 = 84/2 = 42 cm Area of roller = Curved surface of cylinder = 2ฯ€rh = (2ร—22/7ร—42ร—120) cm2 = 31680 cm2 Area of 1 revolution = Area of roller = 31680 cm2 Area of 500 revolution = 500 ร— 31680 cm2 Area of playground = 15840000 cm2 = 15840000 ร—1/(100 ) ร—1/(100 )m2 = 1584 m2

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