Question

a cylindrical roller is a length of 2m and diameter 84 cm find the number of revolutions it has to make to cover an area of 7920 ×100×100 square cm ​

Answer 1

Answer:

length-2m-200cm

radius - diameter/2 - 84/2 - 42 cm

surface area - 2*pi*r*h

                      = 2 * 3.14*42*200

                     = 52800 cm²

1 revolution = 52800 cm²

7920*100*100 revolution = 79200000/52800

                                           = 1500 revolutions

hence answer is 1500 revolutions

Explanation:

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