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How to figure the radius of the 2 circles?

Sample plan: Arc test.plan

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You probably draw:

-temporary rectangle with a polyline.

-draw diagonal line from corner to corner, software should automatically figure out the center of this "Hypotenuse"

-You can get the length  of your diagonal line if you want to, but don't have to.

-Now select the circle about center, draw the circle  from one corner until it locks to the center of your hypotenuse.

-repeat from the other side.

These arcs could be equal or unequal the principle is the same. You may not need this rectangle, it just gives a clue as far as where the transition will be...

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51 minutes ago, BrownTiger said:

temporary rectangle with a polyline.

Thanks, but I'm not sure how that helps. It's obvious where the width comes from, but the height is unknown.

I was probably not clear -- I'm trying to find the radius of the circles.

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Probably golden ratio.

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Thanks Chop

I think my drawing the circles is confusing as they are what I want to create, or more precisely, the arcs formed by them.

Here is another try at explaining.

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Thanks Chop and Michael -- both good solutions.

Another CAD program I sometimes use has an arc tool that allows a pick 3 points method of describing the arc. If Chief offered the same, I think Michael's method would have been obvious.

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8 minutes ago, solver said:

Another CAD program I sometimes use has an arc tool that allows a pick 3 points method of describing the arc. If Chief offered the same, I think Michael's method would have been obvious.

Since you mention that, here's an even better method we have in Chief...

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here's an even better method

Perfect. That's the tool I was wanting and I hate to admit, I'd never even noticed the various arc creation modes.

Guess I need to spend some quality time with the documentation.

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On 10/9/2020 at 10:52 PM, solver said:

Perfect. That's the tool I was wanting and I hate to admit, I'd never even noticed the various arc creation modes

Yep, that was a good example from Michael for that arc mode.  I've seen those arc modes, and used them a couple times, but it's easy to get in a rut of just using what's familiar and readily accessible and forgetting about the other modes available.