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The answers on pages 35-36 and 5 1-52 of the first volume of the eighth grade mathematics of a famous school.
P35: in-class training;

The shortest line segment between two points

Homework after class; BCC has equal vertex angles; The internal angles on the same side are complementary, and the two straight lines are parallel; . . . Parallel congruent angles. . ; Equal isosceles angles; Inner corner. . Two. . . ; 1 1. 12 Do it yourself.