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# Areas Related To Circles

It is given that, and

We know that the circumference C of semicircle of radius be r is

$C=\mathrm{\pi }r$

The inside perimeter of running track is the sum of twice the length of straight portion and circumferences of semicircles. So,
inside perimeter of running track = 400 m

Thus, radius of inner semicircle is 35 m.

Now,
radius of outer semi circle r' = 35 +...

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