Types of quadrilaterals
There are six types of quadrilaterals and these quadrilaterals can be classified by the relationships of their sides and angles.
How to identify a parallelogram
A parallelogram is a foursided polygon with two pairs of parallel and equal sides. The following figure is a parallelogram.
In a parallelogram, all the followings are true:
 Opposite sides are parallel (AB  DC and AD  BC)
 Opposite sides are equal (AB = DC and AD = BC )
 Opposite angles are equal (angle A = angle C and angle B = angle D)
How to identify a rectangle
A rectangle is a parallelogram with 4 right angles. The following figure is a rectangle.
In a rectangle, all the followings are true:
 Opposite sides are parallel (HG  EF and HE  GF)
 Opposite sides are equal (HG = EF and HE = GF)
 All four angles are equal to 90 degrees ( angle E = angle F = angle G = angle H = 90 degrees)
How to identify a square
A square is a rectangle with 4 equal sides.The following figure is square.
In a square, all the followings are true:
 Opposite sides are parallel (JK  IL and JI  KL)
 All four sides are equal (JI = KL = JK = IL)
 All four angles are equal to 90 degrees ( angle I = angle J = angle K = angle L = 90 degrees)
Rhombus: A rhombus is a parallelogram with 4 equal sides. The following figure is a rhombus.
In a rhombus, all the followings are true:
 Opposite sides are parallel (PO  MN and PM  ON )
 All four sides are equal (PO = ON = NM = MP )
 Opposites angles are equal ( angle M = angle O and angle N = angle P)
How to identify a trapezoid
Trapezoid: A trapezoid is a quadrilateral with only
one pair of parallel sides. There are three types of trapezoids.
Scalene trapezoid: A scalene trapezoid is a trapezoid with no equal sides.The following is a scalene trapezoid.
Rightangled trapezoid: A rightangled trapezoid is a trapezoid with two right angles. The following is a rightangle trapezoid.
Isosceles trapezoid: In an isosceles trapezoid, nonparallel sides are equal. The following is an isosceles trapezoid.
How to identify a kite
A kite is a quadrilateral with two pairs of adjacent sides that are equal. Furthermore, no opposite sides are equal.
Types of quadrilaterals quiz. Take the quick to check if you understand this lesson.

Dec 03, 22 12:47 PM
Learn to identify 6 types of triangles based on their sides or angles and 7 more types based on both their sides and angles.
Read More

Nov 18, 22 08:20 AM
Easily learn to construct a box and whiskers plot for a set of data by using the median and the extreme values.
Read More