1.

A well of diameter 150 cm has a 30 cm wide parapet running around it.find the area of the parapet.

Answer»

Diameter of well = 150 cmRadius of well = 75 cm

Area of well Aw = pi*r*r = 22/7*75*75

Area of outer space Ao = pi*R*R = 22/7*(105)*(105)Area of parapet = Ao - Aw= 22/7*15*15(7*7 - 5*5)= 22/7*15*15(24)= 16971.4 cm^2



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