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A 400 metre running track has two straight sections each of length 120 metres and two semicirculars ends. calculate the total length of the c2urved

sections of the track.



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Total length of the straight sections =  120 m + 120 m = 240 meters
Total length of the track = 400 meters

total Length of curved sections = 400 - 240 = 160 meters

Let the radius of the semicircular arcs be R.
Their total length will be = π R + π R = 2 π R
       =>  2 π R = 160 m
        =>    R = 80/π = 25.46 meters

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