The diameter of a roller is 84 cm and its length is 120 cm. It makes 500 complete revolutions to move once over to a level a playground. Find the area of the play ground. ANS 1580 Sq. m

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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

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