A well of diameter 160 cm has a concrete parapet around it. The length of the outer edge of the parapet is 700 cm. Find the width of the prarapet
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A well of diameter 150 cm has a stone parapet around it. If the length of the outer edge of the parapet is 660 cm, then the width of the parapet is ___________.
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Correct option is A)
Given, the Diameter of the well (d) =150 cm.
Therefore radius of well =75 cm
Let radius and diameter of the parapet is R respectively.
Since, length of the outer edge of the parapet =660 cm.
Therefore,
⇒2πR=660cm
⇒2R=
π
660
⇒2R=
22
(660×7)
⇒R=
2
210
cm
Therefore, R=105cm
Now, width of the parapet = ( Radius of parapet - Radius of the well) =(105−75)=30cm
Hence, width of the parapet is 30 cm
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