Because all 3 edges are working against each other - generally with equal force. This means that the constant forces holding the triangle together are always even, hence the sides won't move.
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No. Triangles are the strongest structure.
The two triangles would make either a square or a rectangle.
The triangles must be congruent.
Out of the 3 different kinds of triangles, my favorite is the isosceles.
All isosceles triangles are not equilateral triangles