Cinderella The software for all this is available from Cinderella.

Java-based images to use now on this page. (Return to main Cinderella page)

Properties of parallel lines The red lines are parallel. Move the red and blue points about. The green angles will remain the same. These are called corresponding angles. The yellow angles will also remain the same. These are called alternate angles. (In some books, corresponding angles are called "F-angles" and alternate angles "Z-angles".)

Please enable Java for an interactive construction (with Cinderella).

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