# Rotating a circle to a specific point

**URL:** https://forum.kirupa.com/t/rotating-a-circle-to-a-specific-point/283494
**Category:** flash
**Created:** [March 6, 2009, 8:59pm UTC](https://forum.kirupa.com/t/rotating-a-circle-to-a-specific-point/283494 "2009-03-06T20:59:19Z")
**Posts on this page:** 1
**Page:** 1

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### Author: ![mrbelv](https://avatars.discourse-cdn.com/v4/letter/m/e8c25b/32.png) [@mrbelv](https://forum.kirupa.com/u/mrbelv)
#### Post date: [March 6, 2009, 8:59pm UTC](https://forum.kirupa.com/t/rotating-a-circle-to-a-specific-point/283494/1 "2009-03-06T20:59:19Z")

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What I’m trying to do is make a dial-type of interface, where you click on a point on the edge of a circle and that point will rotate to another point at the top of the circle.

What I can’t figure out is how the make “Point B” rotate to “Point A”, where “Point A” is always fixed at the top of the circle and “Point B” (and Point C and Point D, etc…) are located along different points on the edge of the circle.

I’m using the tween function to rotate, so what I need to figure out is how to get the difference in the rotation between the two points.

I should have paid more attention in geometry in high school.