A quadrilateral is plane figure bounded by four straight lines. The straight line joining the opposite corners is called its diagonal. The diagonal of a quadrilateral divides it into two triangles. Perpendiculars on a diagonal from two opposite corners are known as its offsets. It should be remembered that the sum of all the interior angles of a quadrilateral equals to four fight angles.

__Kinds of a Quadrilateral__**:**

A quadrilateral may be different kinds:

- Square
- Rectangle
- Parallelogram
- Rhombus
- Trapezoid

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