Answer: 2
Explanation: A parallelogram is a quadrilateral which has both pairs of the opposite sides parallel. Congruent triangles are triangles that have exactly the same three sides and exactly the same three angles. So, in a parallelogram, each diagonal divides it in 2 congruent triangles.
Source: Algebra.com
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You can get 2 triangles by cutting a parallelogram in half
It needs only 2 triangles to construct a parallelogram
A parallelogram has two pairs of congruent sides.
Equilateral triangles have three congruent sides and three congruent angles
A polyhedron with two congruent triangles. There are very many possible configurations.