In geometry a quadrilateral is a four-sided polygon, having four edges and four corners.
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°
A figure with exactly four sides
A figure with interior Angles 170 50 100 40
A regular polygon with exactly 2 separate pairs of opposite parallel sides
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