Thursday, 17 April 2014
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The diameter of a roller is 84 cm and its length is 120 cm. It makes 500
ReplyDeletecomplete revolutions to move once over to a level a playground. Find the area
of the play ground. ANS 1580 Sq. m
Explain how ???
Lateral surface area of roller
Delete=2πrh
=2*22/7*42*120
=31680sq.cm
Area of play ground
=31680*500
=15840000sq.cm
Convert sq.cm into sq.m
=15840000//10000
=1584sq.m
multiply no of revolution to surface are of roller to find the area of play ground
ReplyDelete