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The diameter of a roller is 84 cm and its length is 120cm.It takes 500 complete revolutions to move over the level of playground .Find the area of playground in metre square

Posted by Swaneet Singh 7 years, 10 months ago

CBSE > Class 09 > Mathematics

1 answers

Nirupama Parchure 7 years, 10 months ago

D= 84 cm
R = 42 cm
H= 120 cm
CSA of Cylinder = 2πRH
= 2x22x42x120/7
=2x22 x6x120
=31680 sq. Cm
Therefore
Area covered in 1 revolution = CSA of Cylinder
Area covered in 500 revolution = 31680x500
= 15840000 sq.cm
= 15840000/10000
= 1584 sq.m

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