Using alternate interior angles to show two lines are parallel

The video tutorial explains how to determine if two lines, M and N, are parallel by using the concept of alternate interior angles. It introduces the theorem of alternate interior angles, which states that if these angles are equal, the lines are parallel. The tutorial demonstrates setting the angles equal to each other and solving for the variable X to prove their equality. When X equals 63, the angles are equal, confirming that lines M and N are parallel.

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