Question

How do I find arc lengths?

Answer 1

Add up the infinitely many line segments from point a to b
or use an integral
\[\int\limits_{a}^{b}\sqrt{1+(f'(x))^2} dx\]

Answer 2

umm I don't think that's how u do it in this case... ive never seen that??

Answer 3

http://tutorial.math.lamar.edu/Classes/CalcII/ArcLength.aspx

Answer 4

Do you mean arc length of a circle?

Answer 5

You find the arc lengths on the trig unit circle. It is an circle with R = 1.
The arc AM varies counter clockwise on the trig unit circle