In this section we will discuss different types of quadrilateral.
Quadrilateral : It is a closed figure formed by 4 line segments.There are different kinds of quadrilateral,they are as follows : Sum of all the angles of a quadrilateral is always 3600

Example :

Find the measure of the ∠A in the accompanying diagram, if ∠B = 1060,
∠C = 600 and ∠D = 680. Give reasons for your answer. Solution :
∠A + ∠B + ∠C + ∠D = 3600 [ Angles sum of a quadrilateral = 3600]

∠A + 106 + 60 + 68 = 360

∠A + 234 = 360

∠A = 360 - 234

∠A = 1260

Definitions of Different kinds of Quadrilaterals

1) Parallelogram : A parallelogram is a quadrilateral where each pair of opposite sides are parallel.(AB || DC and BC || AD) 2) Rectangle : A rectangle is a parallelogram in which each angle is 900. 3) Square : A square is a parallelogram with all sides equal and all angles are 900 4) Rhombus : Rhombus is a parallelogram with all sides equal and parallel. 5) Trapezoid : It is a quadrilateral with only one pair of parallel sides. AB || CD. If non parallel sides (AD = BC) are equal then the trapezoid is called Isosceles Trapezoid. 6) Right-angled trapezoid: A right-angled is a trapezoid with two right angles. The following is a right-angle trapezoid. 6) Kite : A quadrilateral is a kite,if it has two pairs of equal adjacent sides and unequal opposite sides. 