# How to draw a precise circular arc in Adobe Illustrator?

## How to draw a precise circular arc in Adobe Illustrator?

### Question

Say, an arc with radius *r* centered at *o*, from angle *a* to angle *b*.

I don't see how to use Arc tool in Adobe Illustrator this way. What's the best way to draw it?

2011/04/19

### Accepted Answer

AI sucks for this. Illustrator doesn't draw "real" circles (ie., using centerpoint and radius) either, it makes an `Ellipse`

using bezier curves.

Your best bet is to make a `Ellipse`

with equal width & height (ie., a circle) and use 2 `Line Segment`

shapes to intersect the `Ellipse`

. It takes 3-4 steps instead of 1, but it will allow you to use specific dimensions.

2011/04/20