Maths Arithmetic Progressions Hard
A spiral is made up of successive semicircles, with centres alternately at A and B, starting with centre at A…
A spiral is made up of successive semicircles, with centres alternately at and , starting with centre at , of radii cm, cm, cm, cm, as shown in Fig. . What is the total length of such a spiral made up of thirteen consecutive semicircles? (Take .)
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