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  • The perimeter of borewell of our village is 440 cm. There is an equally wide stone parapetaround this borewell. If the perimeter of borewell with parapet is 616 cm. Let us write bycalculating that how much width of the stone parapet is.?

The perimeter of borewell of our village is 440 cm. There is an equally wide stone parapetaround this borewell. If the perimeter of borewell with parapet is 616 cm. Let us write bycalculating that how much width of the stone parapet is.?

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The perimeter of borewell = 440 cm.

Perimeter of circle = 2pi r

2 imes frac227 imes r=440\ r=440 imes frac722 imes frac12\r=70, cm

Radius of the borewell = 70 cm.

Perimeter of borewell with parapet = 616 cm

2 imes frac227 imes r_1=616\ r_1=616 imes frac722 imes frac12\ r_1=98, cm

Radius of borewell with parapet = 98 cm.

Width of the stone parapet = 

=98, cm-70, cm\=28, cm

Posted by

Deependra Verma

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