what is the difference between co-interior angles and corresponding angles?
Co-interior angles
When two lines are crossed by another line (i.e. transversal), then the pair of angles on one the same side of the transversal but inside the two lines are called co-interior angles (or consecutive interior angles).
Here, in the figure; a and b are co-interior angles; and c and d are co-interior angles.
If the two lines l and m are parallel, then the sum of two co-interior angles is always 180°.
i.e., a + b = 180° and c + d = 180°.
Corresponding angles
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