class 9 Chapter 5 maths part 2 quadrilateral
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Step-by-step explanation:
A quadrilateral is a polygon in Euclidean plane geometry with four edges and four vertices. Other names for quadrilateral include quadrangle, tetragon, and 4-gon. A quadrilateral with vertices A, B, C and D is sometimes denoted as {\displaystyle \square ABCD}.
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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