Question

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Answer 1

Let C1 circle subtend angle 60°

and C2 circle subtend angle 75°

S = r × theta

Here S1 = S2

theta 1 = 60°

theta 2 = 75°

$\frac{r1}{r2} = \frac{ \frac{s1}{theta1} }{ \frac{s2}{theta2} }$

s1 will cancel s2 as both of them are same

r1/r2 = theta 2/ theta 1

= 75°/60°

= 5/4

Hope it helps you buddy