Solve question number 16 with full procedure.
Q16. A wall of diameter 140cm has a stone parapet around it. If the length of the outer edge of the parapet is 616cm, find the width of the parapet.
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Answer:
Given diameter =140 cm.
Then the radius will be d/2 =70 cm.
Let the width of the parapet be x cm.
Clearly, the outer edge of the parapet forms of a circle of radius R=(x+70)cm.
∴ Length of the outer edge of parapet =616cm.
2πR=616 ........ Perimeter of circle
⇒ 2× 22/7 ×(x+70)=616
⇒ x+70= 616×7/22 × 1/2
⇒ x+70=98
⇒ x=98-70 = 18 cm
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