Question

- A cylindrical roller is of length 7 m and diameter 77 cm. Find the number of revolutions it has to make to cover an area of 7920 m​

Answer 1

Step-by-step explanation:

cylinder cover area in 1 rev =it's CSA

CSA of cylinder is 2πrh=2×22/7×.77/2×7

=16.94m²

16.94m²=1rev

7920m² area=7920/16.94=467.53rev

check it!!

Answer 2

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