how to find this sector angle

Question

Given a circle with r is equal 2cm, can we find the sector's angle?

Answer 1

Nope...its not possible with the information you have provided.

From common sense and observation you can easily say the value of the central angle is in someway related to the opposite arc length (they are directly proportional).

We know $s=r\theta$ (s=length of arc,r=radius,$\theta$ is the central angle.).(if you want prove ask in comment)

Now,if you have the arc length.You can use this formula to find $\theta$.

Answer 2

No you can't because you can always draw a circle with an arc with any angle