Yes, it can always be divided in 2 triangles.
This is because every quadrilateral has 2 diagonals. It is these diagonals that divide the quadrilateral into 2 triangles.
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Yes, two equal right-angle triangles.
Infinitely many. Any triangle inside a quadrilateral can be divided into two without affecting the quadrilateral but increasing the number of triangles by 1. And then one of those triangles could be spilt into two and so on - without end.
If it is in the form of two inverted triangles, then there are 8 triangles. If only the outline is used, there are 0 triangles.
The four quadrilaterals that are symmetrical and have two pairs of parallel sides are:SquareRectangleRhombusParallelogram
Yes