They are closed plane figures bounded by straight lines.
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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.
yes quadrilaterals equal 360, triangles equal 180. and shapes with five sides is 540. every time a new side is added add 180
Examples quadrilaterals are:square, rectangle etc
It is a reference to two triangles, ABC and DEF which may or may not be related in any way.
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.