For the given circle:
The radius of the circle = 10
We need to find the length of the arc AB
The central angle opposite to the arc AB = 90 degrees
So, the length of the arc =
[tex](90\cdot\frac{\pi}{180})\cdot10=\frac{\pi}{2}\cdot10=5\pi[/tex]
So, the answer will be AB = [ 5 ] π
