Area Of Cylinder

Chapter 13 Class 9 Surface Areas and Volumes
Concept 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? [π΄π π π’ππ π= 22/7] Roller is of form cylinder Radius = π·πππππ‘ππ/2 = 84/2 = 42 cm Area of roller = Curved surface of cylinder = 2Οrh = (2Γ22/7Γ42Γ120) cm2 = 31680 cm2 Area of 1 revolution = Area of roller = 31680 cm2 Area of 500 revolution = 500 Γ 31680 cm2 Area of playground = 15840000 cm2 = 15840000 Γ1/(100 ) Γ1/(100 )m2 = 1584 m2

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