Question

define triangle and quadrilateral

Answer 1

 a quadrilateral is a polygon with four edges (or sides) and four vertices or corners. Sometimes, the term quadrangle is used, by analogy with triangle, and sometimes tetragon for consistency with pentagon (5-sided), hexagon (6-sided) and so on.....

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Answer 2

triangle:- triangle is a closed figure with three sides
Quadrilateral:- quadrilateral is a closed figure made of four Straight edges and four corners . it is also named as quadrangle