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Compulsory Education Curriculum Standard Experimental Textbook Math Grade Seven Volume II Page 22 Exercise Answers
A: 1. (1) The topic is that AB is perpendicular to CD, its vertical foot is O, and the conclusion is that the angle AOC is 90 degrees.

(2) Assume that two straight lines are parallel. The conclusion is that the isosceles angles are parallel.

2. "Equiangular" is a true proposition and an axiom, just like "1+ 1=2". If there is no reason, recite it.

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