Question

what is quadrilateral​

Answer 1

Answer:

a quadrilateral is a polygon with four edges and four vertices. Sometimes, the term quadrangle is used, by analogy with triangle, and sometimes tetragon for consistency with pentagon and hexagon, or 4-gon for consistency with k-gons for arbitrary values of k.

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Answer 2

Answer:

In Euclidean plane geometry, a quadrilateral is a polygon with four edges and four vertices. Sometimes, the term quadrangle is used, by analogy with triangle, and sometimes tetragon for consistency with pentagon and hexagon, or 4-gon for consistency with k-gons for arbitrary values of k. Wikipedia

Area: ½ x diagonal x (sum of perpendicular heights)

Perimeter: sum of sides of the quadrilateral

Number of vertices: 4

Number of edges: 4

Internal angle: 90° (for square and rectangle)

Sum of interior angles: 360°