① Completely coincident figures ② Two triangles that can be completely coincident ③ Same symbol (uncertain)

(4) A triangle that can completely overlap is called congruent triangles.

⑤ Angle ⑤ Edge ⑧ Oblique angle ⑨ Right angle.

Attending two triangles are congruent, and their corresponding sides are equal.

(1 1) Two triangles are congruent and the corresponding angles are equal.

(12) On the opposite side of the intersection angle, the line segment obtained is called the bisector of the triangle.

(13) The two angles divided by a line segment are equal, which is called the bisector of this triangle.

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