Lines a and b are parallel. When they are cut by transversals, they form a triangle.

es025-1.jpg

What is es025-2.jpg

es025-3.jpg

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In the given diagram, lines a and b are shown as parallel lines. When two parallel lines are intersected by a third line called a transversal, they form several pairs of corresponding angles.

Looking at the diagram, es025-2.jpg represents a triangle formed by the intersecting lines and the parallel lines. It is a triangle because it is a closed figure with three sides.

On the other hand, es025-3.jpg is not provided in the question. Please provide more information or clarify your query if you are referring to something specific.