Proof of ppt-Xiangjiao version nine courseware

Xiangjiao Jiu Shang 2.4 "Proof" ppt is based on the condition of a proposition, and the same reasoning (inference), and his conclusion is established, thus judging that the proposition is true, this process is called proof. 1. Prove that the two straight lines are intercepted by the third straight line. If there is a pair of co-located angles equal, then the other pairs of co-located angles are also equal, and the internal misalignment angles are equal, and they are complementary to the adjacent internal angles. Proof: ∠ 3 = ∠4, ∠5 = ∠6, ∠7 = ∠8, ∠7 = ∠2, ∠5 = ∠4, ∠5 + ∠2 = 180o, ∠7 + ∠4 = 180o.

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