To level the top of the school playground for the annual sports, a hand drawn roller of diameter 56cm was engaged. A group of students involved in the job found that after making 10 continuous round the roller could level an area of 15.84 metre square. Find the length of the roller.
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Answer:
length of the roller = 90 cm
Step-by-step explanation:
roller of diameter 56cm
Radius = 56/2 = 28 cm
Circumference = 2 π R = 2 * (22/7) * 28
= 176 cm
one Round = 176 cm
10 Rounds = 176 * 10 = 1760 cm
= 17.6 m
Let say Roller length = L m
Then Area Covered = 17.6 * L m²
17.6 * L = 15.84
=> L = 0.9 m = 90 cm
length of the roller = 90 cm
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