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Right angle triangles
You could, but it is not completely necessary.
Right triangles - those with a 90-degree angle.
Triangles do not have parallel lines but as right angles triangles they do have perpendicular lines that meet at 90 degrees.
Angle Angle Side is a method one can use to prove that two triangles are congruent. Basically, if any two pairs of angles and the side between these angles are congruent, then the triangles are congruent as well.