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Question

Find the diameter of a circle whose circumference is
(i) 12.56 cm
(ii) 88 m
(iii) 11.0 km

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Solution

(i) ​We know that the circumference C of a circle of diameter 'd' is given by:
C = πd
d = CπHere, C = 12.56 cmd = 12.56×722 cm = 87.9222 cm = 3.99 cm.

(ii) ​We know that the circumference C of a circle of diameter 'd' is given by:
C = πd
d = CπHere, C = 88 md = 88×722 m = 28 m .

(iii) ​We know that the circumference C of a circle of diameter 'd' is given by:
C = πd
d = CπHere, C = 11 kmd = 11×722 km =72km= 3.5 km.

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