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90 degree triangles are always similar.
Two right angle triangles, normally scalene triangles. However, if the rectangle is for example a square, then it would be two isosceles triangles.
Goal conflict is when we have alternative goals including both Minimization and Maximization of problem .And Goal congruence is when we have alternative goals of same type , either maximizatioin or minimization. Example: Minimizing distance and maximizating closeness ratio in facility layout problem are two conflict goals. Minimizing flow and minimizing risky transpot are congruent goals.
A parallelogram can be split into two congruent triangles known as "parallelogram halves" or "diagonally opposite triangles." These triangles share a common base, which is half the length of the parallelogram's diagonal. The height of each triangle is the perpendicular distance between the base and the opposite side of the parallelogram.
There are two types of quadrilaterals that are formed when two congruent equilateral triangles are joined. These shapes are rhombus and parallelogram.