Monday, November 28, 2011

The Parallel Postulate

In the figure below, AB and CD are parallel lines. EF is a transversal.
This is a Java Applet created using GeoGebra from - it looks like you don't have Java installed, please go to

The parallel postulate states that given two parallel lines (on the same plane) and a transversal, their corresponding angles are congruent. Using this postulate as shown above, determine the measure of the other angles and record your observations. Make a conjecture about them.

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