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** Q 2929334211. ** A spiral is made up of successive semi-circles, with centres alternately at A and B, starting with centre at radii 0.5 cm, 1.0 cm, 1.5 cm, 2.0 cm, as shown in figure, what is the total length of such a spiral made up of thirteen consecutive semi-circles?

(Take `\pi= \frac{22}{7}`)