A paint roller is cylindrical in shape. It has a diameter of 6.2 cm and a width of 39.6cm. Find the area painted by the roller when it makes one revolution, correct to the nearest 0.01 cm2.
Answers
Given : A paint roller is cylindrical in shape. it has a diameter of 6.2 cm and a width of 39.6 cm.
To find : The area painted by the roller when it makes one revolution.
solution : The area painted by the roller when it makes one revolution = surface area of cylindrical roller
= 2πrl
= 2 × 3.14 × (6.2cm/2) × (39.6 cm)
= 6.28 × 3.1 × 39.6 cm²
= 770.9328 cm² ≈ 770.93 cm²
Therefore The area painted by the roller when it makes one revolution is 770.93 cm²
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