Question

A well diameter 140cm hasa stone parapet around it. If the length of the outer edge of the parapet is 616 cm ,find the width of the parapet.

Answer 1

$let \: width \: of \: parapet = x \\ r1 = \frac{140}{2} = 70cm \\ r2 = 70 + x \\ 2\pi \: r2 = 616 \\ 2 \times \frac{22}{7} \times (70 + x) = 616 \\ \frac{44}{7} \times (70 + x) = 616 \\ 70 + x = \frac{616 \times 7}{44} \\ 70 + x = 14\times 7 \\ x = 98 - 70 \\ x = 28cm$

Answer 2

The width of the parpet is 28 cm

Step-by-step explanation:

Diameter of well = 140 cm

Radius of well =$\frac{140}{2}=70 cm$

The length of the outer edge of the parpet is 616 cm

Circumference =$2\pi r = 2 \times \frac{22}{7} \times r$

So, $2 \times \frac{22}{7} \times r=616$

$r=616 \times \frac{7}{2 \times 22}$

r=98 cm

Width of parpet = 98 cm - 70 cm = 28 cm

Hence the width of the parpet is 28 cm

Learn more:

A well with a brick paapet around it has diameter 210 cm of the length of the outer edge of parpet is 880 cm then find the width of the parpet

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