A rhombus.
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If the triangle is the same size, and it's sides are congruent to the other, then yes they are congruent to each other.
A TETRAHEDRON. Incorrectly named as a 'triangular pyramid'.
In geometry two figures are congruent if they have the same shape and size if they are non congruent they do not have the same shape and size two triangles are congruent if their corresponding sides are all equal in lengh and their corresponding angles are equal in size
Parellelogram
A square, because congruent means equal.