For the pair of points, find the slope of the line that passes through both points. (1,1) and (5,7)
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Hello,
=70 (sum of angles of a triangle=180°)
supplementary angles
translation BC
image of the angle DAB by the axis symmetry DB
opposed angles of a parallelogram
are supplementary.
opposed angles by the vertex
alterne-interne angles (sorry for the words English is difficult for me)
are supplementary.