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] Class 10 Maths-Ex 5.3 Q 18 Chapter 5 Arithmetic Progressions #maths #ncert #class10 @brainosolutions