No, because the fact that tri means "three" and quad means "four", it's highly impossible for a triangle to be a quadrilateral. Triangles only have 3 sides to them while quadrilaterals have 4.
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Quadrilaterals are polygons with four sides. Triangles are polygons with three sides.
Quadrilaterals, which have 4 sides, are not the same as triangles which have 3 sides. Some similarity exists in that both are geometrical figures.
The diagonals of a square for example divides it into 4 isosceles triangles
Quadrilaterals and triangles.
180 degrees and for quadrilaterals there are 360 degrees. :)