The inside perimeter of a running track is 340m. The length of each straight portion is 60m and the curved portions are semicircles. If the trackis 7m wide, find the area of the track. Also, find the outer perimeter of the track.

Explanation

Perimeter of running track=`2pir+120=340`

`=2pir=220`

`=r=35m`

Area of track=area of straight portion +arrea of curved portion.

`=2*60*7+2pi(r_1^2-r_2^2)`

`=840+44*77`

`=4228m^2`

Outer perimeter of track`=60*2+2*22/7*42`

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