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1 solution
In this problem. there is no need of height as it was given to think on it . so in the problem the arcs on the three circles made one circle. therefore circumference of the circle =2 * pi * 3.5 . and, you can see in the fig. the ropes other than the three arcs, the diameter of the the two circles act like the three lines therefore adding all u can get 7 * pi + 21 therefore , a + b = 28