Thread: find points along a circle in relation to other points on the circle

I've made a diagram to explain this better:
http://www.zerostatic.com/diagram.jpg

I would like to space out the red circles so their edges touch. I guess I need to know how many degrees away to place a circle based on the radii ?

Also if I were to place these along an Ellipse, can I use the same formula that a circle would use?

Don't have time to delve into this right now, but consider this as a basis.

If you have a circle with radius = 1.000

and you wish to surround it with semicircles, one option is to get 90 circles with radius 0.0349 and space them every 4 degrees.

thanks but the circles that will be added are of random varying sizes, so I would need to somehow calculate based on the radius of the circle next to it.

Originally Posted by zerostatic

thanks but the circles that will be added are of random varying sizes, so I would need to somehow calculate based on the radius of the circle next to it.

I understand. Sometimes it's easier to derive a formula when you have a working example

Maybe it makes more sense if I reword this...
If I have a circle who's circumference is known - say 10.5 meters.
And I want to plot two points on that circle who's arc distance need to be 1 meter. How would I calculate this in order to plot the two points on the circumference of the circle?