Question

Adiameter of rollers 84 cm and length is 120cm it takes 500complete revolution to roll once over the playground to level find the area of all play ground in m square

Answer 1

$r1 = 1 r2 = 3 r3 = 6..v = 1.5$

Answer 2

Radius of the roller (r) = 84/ 2 cm = 42 cm

Length of the roller (h) = 120 cm

Curved surface area of the roller = 2πrh

= 2 × 22/ 7 × 42 × 120 cm2 = 44 × 720 cm2 = 31680 cm2

∴ area covered by the roller in 1 revolution = 31680 cm2

∴ area covered by the roller in 500 revolutions = 31680 × 500 cm2

= 15840000 cm

Hence, area of the playground = 15840000/ 100× 100 m2 = 1584 m2       Ans.

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