Yesterday is posted this question which has been mostly answered. Thx for all the help. I have a follow-up question though, hopefully someone can help me.

Is there a way to set the rotation (AB) so that line C is exactly 5 meters?
I tried different snapping methods, but even without snapping ( and a steady hand ) 5.00 meters seems impossible.

You could only get Line C to be exactly 5 if you know what angle c is and rotate Line B to that angle. Just use @slbaumgartner’s plugin to identify the corner, draw the triangle, and get on with your modeling.

Hi DaveR, I did and the plugin works like a charm, however, I assumed (should stop doing that) a tool like SketchUp simply has such a feature out of the box. Especially when used in architecture where lengths and corners are accurate.

That being said, I also need the non-plugin way as I do not always have access as an admin to install plugins (I use sketchup for multiple companies, all running on their computers, non network).

John, thank you for the tip. It is indeed more time consuming but a great solution when no plug-in is at hand.

You ought to go out an measure some architecture. If that’s your standard, set Precision to nothing past the decimal and you’ll find you can get the lengths close enough.

(I made a video, but I’m not getting it to upload)

Once imported into SU, it comes out like this, losing the accuracy in the arcs in the process, but the triangle is correct. 3,5,6m triangle fr PowerCADD.skp (137.4 KB)

I don’t normally have the units set that far out, but I thought I’d see if any error could be seen creeping in.

I do use a Leica Disto when I measure existing buildings. It’s good to about 1/16" or better. I usually round to 1/8" or 1/4" and idealize minor amounts of out-of-plumb and out-of-square-ness.

Someone told me the Army Corp. of Engineers has a motto: “Measure it with a micrometer, mark it with a grease pencil and cut it with an ax.” I always liked that.

Awhile back there was a guy who was complaining because he couldn’t draw his SketchUp model with more than six places beyond the decimal in millimeters. This was for an object he was going to 3D print. He had no tools with which to measure that precisely and the dimensional tolerance of the printer was much coarser than that. It’s just a waste of time and energy to chase that kind of precision in that application. A sure way to make yourself crazy.

Trias follow the inequality rule and once you have the sequence of sides the law of cosines can be used to check you results; A+B>C;B+C>A;A+C>B and must be satisfied for all three conditions of the sides

The simplest way to construct this triangle is to draw the baseline to the required length (6), then from one end draw a circle with radius of 5, and from the other end draw a circle with a radius of 3. The point of intersection of the circles is the third corner of the triangle. Of course, then you fall prey to the not-really-a-circle syndrome, but if you bump the number of segments up real high you can still achieve reasonable accuracy.