a racing track whose left and right ends are semicircular . the distance between two inner parallel line segments is 70 m and they are each 105 m long . if the track is 7 m wide , find the difference in the lengths of the inner edge and outer edge of the track .

Answer 1

The inner rectangle is 70x105
the inner circle has radius 35

the outer rectangle is 84x105
the outer circle has radius 42

now just figure the areas and subtract inner from outer