If the sum of the angles are 180°, the angles are supplementary.
A transversal is a line that passes through two lines in the same plane at two distinct points.
Straight angle=180 degree
If two parallel lines are intersected by a transversal, then pairs of alternate interior angles are Equal.
use angle sum property of quadrilaterals
Co-interior angles are on the same side of thetransversal.
Draw an imaginary line
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