what is a quadrilateral???
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In Euclidean plane geometry, a quadrilateral is a polygon with four edges and four vertices or corners. 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°
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