Use two lines of notebook paper as parallel lines and draw any
transversal. Use a protractor to measure
Measure one pair of alternate interior angles. Repeat the experiment with another transversal. What appears to be true?
It appears to be true that alternate interior angles are equal.
Draw two parallel lines and two transversal lines as shown in the figure.
Alternate interior angles: These are the two nonadjacent interior angles which are on the opposite sides of the transversal.
Use protractor to measure of the alternate interior angles in both cases. It can be observed that .
Hence, alternate interior angles are equal.
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