impossible to deduce the angle from two points and the perpendicular to the vertical

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deduce the angle between the shoulders and the horizontal

Anatole MARTIN--DELALONDE
1 Posts

Hello,

From 2 point and from the perpendicular to the vertical (finally the abscissa of the reference). I would like to be able to deduce the angle between the shoulders and the horizontal, for a scientific experiment. Can you help me please? Thank you in advance.