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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.

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  1. 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/

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

  3. 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.

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

  5. How it looks when they’re NOT congruent…

  6. Is 1 2 ? 2 1 1

  7. Is 1 2 ? 2 1 1

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

  9. Is 1 2 ? 2 1 1

  10. Is 1 2 ? 2 1 1

  11. Is 1 2 ? 2 1 1

  12. Is 1 2 ? 2 1 1

  13. Is 1 2 ? 2 1 1

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

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

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

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