8.
QUADRILATERALS
8.1 Introduction,
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In Euclidean plane geometry, a quadrilateral is a polygon with four edges and four vertices. Other names for quadrilateral include quadrangle, tetragon, and 4-gon. A quadrilateral with vertices, and is sometimes denoted as. 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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