Areas Related to Circles
It is given that, and
We know that the circumference C of semicircle of radius be r is
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.
radius of outer semi circle r' = 35 +...
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