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Q.

A circle's boundary is formed using 10.5km long wire, what will be circumference of that circle?

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a

21πœ‹ km

b

10.5km

c

10.5m

d

21km

answer is A.

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Detailed Solution

Circumference is length of boundary of a circle.

Circle's boundary is formed using 10.5km long wire.

Therefore, Length of boundary will be 10.5km

Therefore, Circumference of this circle = 10.5km.

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