I need to extrude a triangular shaped bar but first I need to draw the triangle profile. It has sides 152mm x 183mm x 112mm. Is there I way I can do that without having to calculate what the angles are first?
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Tiger Mike’s way is excellent. Another way is to simply sketch 3 connected lines and resize them respectively.
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Some techniques never go out of style. Was using this kind of thing for woodworking stuff ages ago, but had forgotten it until I saw your animation here.
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Yes indeed. This is basically 8th grade Drafting 1, using ruler and compass.
Why would you need to calculate the angles? You can simply set the length of the sides.
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If only Drafting was still current curriculum 
I learned all of this from helping my dad in the workshop.
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Sorry for not replying sooner, but thank you for this. I’m ashamed I didn’t think of it myself and I really appreciated the video.
My high school had drafting tables left over from when they used to offer the class, stopping about 4 years before I entered (in 1982). I would have loved such a class.
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Geometry class should work: triangle constructions.