Question

Find the area level by a cylindrical roller of diameter 60 cm and length 2.1 metre in 150 revolution

Answer 1

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Answer 2

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Here is your answer.
Diameter of cylindrical roller is 60 cm

Radius = D/2
= 60/2
= 30 cm
= 30/100 (as 1 cm = 1/100 m)
= 0.3 m

Length (Height) = 2.1 m

As we know the formula
Surface Area of cylindrical roller is= 2πrh
$= 2 \times \frac{22}{7} \times 0.3 \times 2.1 \\ \\ = 3.96 \: m {}^{2}$
Now
Cylindrical roller covers 150 revolution
Hence
Area Covered by Cylindrical roller is
= 150 ×3.96
= 594 sq.m

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