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In the third class on P3 page of the seventh grade math exercise book, I asked that I must do it before 0 o'clock tonight. ! !
Solution: (1)∠3 and ∠4 are the inscribed angles of straight lines AB and AC cut by straight line DF.
(2)∠2 and ∠5 are isosceles angles that straight lines AB and AC are cut by straight line DF.
(3)∠4 and ∠A are the inner angles on the same side that straight lines AB and DF are cut by straight line AC.