Question

18. 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
22
semicircles?
7
​

Answer 1

Answer:

the question is a and b and it was the 7th question of it is and 5 open 1.05.51 what is the total length of such a spiral is made up of two consecutive 22

Answer 2

Answer:

Step-by-step explanation:

Perimeter of first semi circle=22/7**12=11/7

Perimeter of 2nd semi circle=22/7*1=22/7

so,d=22/7-11/7=11/7

$S_{13}$ = $\frac{13}{2}$ (2*$\frac{11}{7}$+$\frac{11}{7}$*12)

=$\frac{13}{2\\}$($\frac{22+132}{7}$)=13/2*154=143cm