(Solved): A20, a) \( \mathrm{A} \) trinagle in the plane \( R^{2} \) is given by the three poetate \( \mathrm ...
A20, a) \( \mathrm{A} \) trinagle in the plane \( R^{2} \) is given by the three poetate \( \mathrm{n}=(5 ; 0), b=(0,1) \). \( c=(3,3) \). Fand the interniel angles of the trianvle at ench of the there points without unipe your caleculatot