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Last updated at May 29, 2018 by Teachoo
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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? [๐ด๐ ๐ ๐ข๐๐ ๐= 22/7] Roller is of form cylinder Radius = ๐ท๐๐๐๐๐ก๐๐/2 = 84/2 = 42 cm Area of roller = Curved surface of cylinder = 2ฯrh = (2ร22/7ร42ร120) 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 ร1/(100 ) ร1/(100 )m2 = 1584 m2
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