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Licensing information Users should treat this material as a working draft. This material can be used in its current form, customized, redistributed and/or printed or displayed by the user. The author(s) request feedback on all materials so that they can be continually improved and updated. This material is licensed under the Creative Commons Attribution license: (http://creativecommons.org/licenses/by/2.5/). Author: Kevin Hall Wording for the legal statement above is adapted from the legal statement for Trigonometry, published in 2009 by The CK-12 Foundation: http://about.ck12.org/

Comparing Corresponding Angles With Tracing Paper 1 1 2 Where should 2 go to be corresponding to 1 ? Trace 1 on tracing paper.

Comparing Corresponding Angles With Tracing Paper 1 1 2 The angles match up perfectly! They’re congruent. Slide your trace of 1 onto 2 and compare them.

Comparing Corresponding Angles With Tracing Paper 1 1 2 The angles match up perfectly! They’re congruent. Tape your tracing paper down on 2.

How it looks when they’re NOT congruent…

Is 1 2 ? 2 1 1

Is 1 2 ? 1 2 1

We can’t compare them yet. Is 1 2 ? 1 2 1 Not lined up!!! We can’t compare them yet.

Is 1 2 ? 1 2 1

Is 1 2 ? 1 2 1

Is 1 2 ? 1 2 1

Is 1 2 ? 1 2 1

Is 1 2 ? 1 2 1

Is 1 2 ? 1 2 1 Still not lined up!!!

Now it’s lined up correctly Is 1 2 ? Now it’s lined up correctly 1 2 1

Angle 1 and Angle 2 do not match up. They are not congruent. Is 1 2 ? 1 2 1 Angle 1 and Angle 2 do not match up. They are not congruent.