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How to say the outer corner of the triangle in the second volume of seventh grade mathematics published by People's Education Press?
External angle: the angle formed by one side of a triangle and the extension line of the other side teaches the external angle of the triangle. Essence: the external angle is the adjacent complementary angle of the internal angle.
Exterior Angle Theorem: One exterior angle of a triangle is equal to the sum of two interior angles that are not adjacent to it.
Inference: The outer angle of a triangle is greater than any inner angle that is not adjacent to it.