What triangles are called equal?

First, consider the very concept of a triangle.
A triangle is a geometric figure consisting of three line segments connecting three points lying in the same plane.

In geometry, there are only three signs of the equality of triangles.

1) On two sides and the angle between them:
Triangles are equal if they have equal two sides and the angle between them.

2) Two corners and one side:
Triangles are equal if at least two angles and the side between them are equal.

3) On three sides:
Triangles are equal if all three sides are equal.

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