# Elements of a Quadrilateral

Parts or elements of a quadrilateral are discussed here.

ABCD is a quadrilateral with four sides namely AB, BC, CD and DA.

It has four vertices namely A, B, C and D. The angle between two adjacent sides is an angle of the quadrilateral. So, a quadrilateral has four angles that is, ∠DAB, ∠ABC, ∠BCD and ∠CDA.

A line segment joining a pair of opposite vertices is called a diagonal. So, there are two diagonals namely AC and BD.

A quadrilateral may have some relations between its sides and angles. On the basis of these relations, quadrilaterals are classified and given different names.

Elements of a Quadrilateral.

Parallel Lines.

Perpendicular Lines.

Construction of Perpendicular Lines by using a Protractor.

Sum of Angles of a Quadrilateral.

Practice Test on Quadrilaterals.

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