The diameter of a roller is 35 cm and its length is 100 cm. It takes 200 complete revolutions to level a playground. Find the area of the playground in m2
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Correct answer: D
Explanation
The correct answer is option 4 i.e. 220.
Radius (r) = 35/2 = 17.5 cm
Circumference = 2πr = 2 × (22/7) × 17.5 = 110 cm
Length of the roller (h) = 100 cm
Area leveled in one revolution = 110 × 100 = 11000 cm2
Total area of the playground = 11000 × 200 = 2200000 cm2 = 220 m2