If in two circles, arcs of the same length subtend angles  60 ∘   and  75 ∘   at the Centre, find the ratio of their radii.

# If in two circles, arcs of the same length subtend angles    and    at the Centre, find the ratio of their radii.

1. A
2. B
3. C
4. D

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### Solution:

We know that the arc length is  .
Converting the given angle into radian, and we have
For  ,

For  ,

Given that their lengths are equal. Then,

Hence, the correct option is 3.

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