The diameter of a roller is 84cm and it's length is 120cm. It takes 500 complete revolution to move once to level the play ground. Find the area of play ground.
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==> D = 84cm
==> R = 84/2 = 42cm
==> L = h = 120cm.
===> C.S.A = 2πrh
===> = 2 × 22/7 × 42 × 120
===> = 2 × 22 × 6 × 120
===> = 31680cm^2
complete revolution = 500
=========> 500 × 31680
Area of playground in cm^2 = 15,840,000cm^2
Find in m^2
1m^2 = 10,000cm^2
( 1m = 100 cm
1m^2 = 100cm × 100cm = 10,000cm^2)
1m^2 = 10,000cm^2
15840000 = 15840000/10000 = 1584m^2
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