Answer :

The fourth diagram show lines that must be parallel lines cut by a transversal

What is Straight line?

A line is an infinitely long object with no width, depth, or curvature.

Parallel lines refers to two lines which can be found on the same plane, at an equidistance and does not meet.

A transversal is defined as a line that passes through two lines in the same plane at two distinct points in the geometry.

The fourth diagram has two same-side interior angles that are supplementary (add to 180°).

The converse of the same-side interior angle theorem states that if two lines are cut by a transversal and the same side interior angles are supplementary, then the lines are parallel.

Hence, the fourth diagram show lines that must be parallel lines cut by a transversal

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