No.
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Given unchanging lengths of the sides, a triangle cannot change its shape. But given unchanging lengths of the sides of a rectangle, it can change its shape by some force by changing its angle measurements. If a 2d load were put on a rectangle, enough force could squish the rectangle into a parallelogram, whereas a triangle cannot change shape without changing the lengths of its sides or bending its sides out of shape (most likely into a curve).Given these properties, a rectangle can collapse its shape much more easily and is flimsy compared to a triangle.
no a rectangle is very different from a rhombus because a rhombus different angles than a rectangle
No, a 2 by 4 rectangle is not congruent to a 4 by 8 rectangle. They are similar, but the 4 by 8 rectangle is 4 times bigger than the 2 by 4.
triangle
Not necessarily. In fact, if a rectangle and parallelogram have the same base and height, their areas are equal.