es biconditional statements in the Elements, the nese two propositions may seem fairly obvious, th ed to as the "Vertical Angle Theorem" as it asse If a straight line set up on a straight line make es or angles equal to two right angles. D- E B C Figure 3.21. Proposition 1.13 on the straight line

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A: Here, we need to show that if x∈A, then x∉B provided B⊂Ac.  Or, if x∈B, then x∉A provided B⊂Ac.

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