A spiral is made up of successive semicircles, with centres alternately at A and B,
starting with centre at A, of radii 0.5 cm, 1.0 cm, 1.5 cm, 2.0 cm, ... as shown in
Fig. 5.4. What is the total length of such a spiral made up of thirteen consecutive semicircles ? ( Take π = 22/7)
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