2.3 Quadrilaterals

  • Types Properties of Quadrilaterals • Perimeter Area

A quadrilateral is a closed plane figure with four sides, these four sides form four interior angles. A general quadrilateral is shown in Fig. 2.51.

A quadrilateral or 4 sided polygon that is closed and has 4 interior angles.

Fig. 2.51

A diagonal of a polygon is a straight line segment joining any two nonadjacent vertices. The dashed line is one of two diagonals of the quadrilateral in Fig. 2.52.

A quadrilateral with a diagonal from one vertex to another, non-adjacent vertex.

Fig. 2.52


A parallelogram is a quadrilateral in which opposite sides are parallel. In a parallelogram, opposite sides are ...

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