A well of diameter 140 cm has a stone parapet around it. If the length of the outer edge of the parapet is 616 cm, find the width of the parapet. Please solve this sum in detail

Given, the diameter of the well (d) = 140 cm

Let radius and diameter of the parapet is R and D respectively.

Sine, length of the outer edge of the parapet = 616 cm.

Therefore,

Now, width of the parapet = ( diameter of the well - diameter of parapet )/2  = (d-D)/2 = (196-140)/2 = 28 cm

Hence, width of the parapet is 28 cm.