If a transversal intersects two parallel lines, then sum of interior angles on the same side of a transversal is______
Define interior angles and apply the same side interior angle theorem
Definition : When a transversal intersects a pair of straight lines , different angles are created. The angles that
are called same side interior angles or co-interior angles.
According to the same side interior angle theorem, the interior angles are always supplementary.
A pair of supplementary angles always add up to by their definition
Hence the sum of the interior angles on the same side of the transversal is