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3: Half-Planes

Last updated

Sep 5, 2021
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- 2.5: Vertical angles
- 3.1: Sign of an angle

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This chapter contains long proofs of intuitively evident statements. It is okay to skip it, but make sure you know definitions of positive/negative angles and that your intuition agrees with Theorem 3.3.1, Proposition 3.4.1, Corollary 3.4.1, Theorem 3.4.2, and Theorem 3.5.1.

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