You can divide a quadrilateral up into as many triangles as you want, but at least two.
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There are no triangles in a square. A triangle is a 3 sided figure. A square is a 4 sided figured classified as quadrilateral meaning it has 4 sides. A triangle can be any size, as long as it has 3 sides. A quadrilateral can also be any size it just has to have 4 sides as well.
In general, a parallelogram. But if the triangles are joined along their odd side, a rhombus.
If you accept that the sum of the angles in a triangle is 180 degrees, then picture this. A quadrilateral shape is two triangles. If you draw a line between one pair of opposite corners in quadrilateral shape, you have two triangles that share a common side. The sum of the angles in the quadrilateral must equal the sum of the angles in the two triangles. 2 x 180 = 360
there are 27 triangles in a triangle