Question

class 10 exercise 5.3 question no.18 ka solution.

Answer 1

Step-by-step explanation:

Given

n=13

$a = 0.5\pi$

$d = 0.5\pi$

Sn=n/2[2a+(n-1)d]

$s13 = \frac{13}{2} (2 \times 0.5\pi + 12 \times 0.5 \pi) \\ \pi = \frac{22}{7} \\ s13 = 7.5 \times (1 \times \frac{22}{7} + 6×22/7) \\ s13 = 7.5 \times ×22/7 \frac{22 + 42}{7} \\ s13 = 143cm$

Therefore,

The total length of spirals made up by of thirteen semicircle is 143 cm