Four-sided polygon.
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Qaud.
5syllables
The word quadrilateral is derived from a combination of the Latin quattuor (four) and lateralis(side).
It has 5 syllables.
Quadrilaterals are not triangles, and there is no such thing as a quadrilateral triangle. Perhaps you mean equilateral, in which case, it has 3 equal angles and 3 equal sides; the word equilateral actually means equal sides. And quadrilateral means four sides. Triangle means 3 angles.