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Calculate orientaiton given 3 points

Hi, I know it basically is something that one should conclude going step by step with API but somehow I cannot manage so I hope someone can guide me through...

The assumption is that I have triangle equal arms, known size and i rotate it in my hand. I would like to get it orientation like in video below https://www.youtube.com/watch?v=wVPcXGGsVlM

If triangle is not good then other shape can be good enough. the point is that I would like to make something to keep in in hand and be able to manipulate a'la controller. Thanks.