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Mathematical proof: the top and bottom of two isosceles triangles are equal, so is this triangle congruent? Please prove your conclusion.
Because the sum of the internal angles of a triangle is 180, if the top angle is a, then the bottom angle is 180-A divided by 2, and because of the correspondence of the top angles, the bottom angles are equal.

Triangular

Vertex angle = vertex angle (known)

Bottom Angle = Bottom Angle (Collected)

Bottom edge = bottom edge (known)

So they are equal (AAS)