Different species of forms differ indigenous each other in terms of sides or angles. Countless shapes have actually 4 sides, yet the distinction in angle on your sides provides them unique. We contact these 4-sided shapes the quadrilaterals.

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In this article, you will certainly learn:

What a quadrilateral is.How the different varieties of quadrilaterals look at like.The properties of quadrilaterals.


What is a Quadrilateral?

As words suggests, ‘Quad’ means four and also ‘lateral’ means side. Because of this a quadrilateral is a closed two-dimensional polygon comprised of 4-line segments. In an easy words, a quadrilateral is a shape with 4 sides.

Quadrilaterals space everywhere! native the books, graph papers, computer system keys, television, and mobile screens. The list of real-world examples of quadrilaterals is endless.

Types that Quadrilaterals

There are six quadrilateral in geometry. Few of the quadrilaterals room surely acquainted to you, if others might not be so familiar.

Let’s take it a look.


 A rectangle

A rectangle is a quadrilateral through 4 appropriate angles (90°). In a rectangle, both the pairs of opposite sides space parallel and equal in length.


Properties of a rhombus

All sides room congruent through definition.The diagonals bisect the angles.The diagonals in a dragon bisect each various other at right angles.


Properties of Quadrilaterals

The properties of quadrilateral include:

Every quadrilateral has 4 sides, 4 vertices, and also 4 angles.4The complete measure of every the four interior angle of a quadrilateral is constantly equal to 360 degrees.The sum of inner angles the a square fits the formula the polygon i.e.

Sum of inner angles = 180 ° * (n – 2), where n is same to the variety of sides of the polygon

Rectangles, rhombus, and also squares are all varieties of parallelograms.A square is both a rhombus and also a rectangle.The rectangle and also rhombus space not square.A parallelogram is a trapezium.A trapezium is not a parallelogram.Kite is not a parallelogram.

Classification of quadrilaterals

The quadrilaterals space classified right into two an easy types:

Convex quadrilaterals: These are the quadrilaterals with internal angles less than 180 degrees, and the two diagonals are inside the quadrilaterals. They incorporate trapezium, parallelogram, rhombus, rectangle, square, kite, etc.Concave quadrilaterals: These are the quadrilaterals v at least one interior angle greater than 180 degrees, and at the very least one that the 2 diagonals is external the quadrilaterals. A dart is a concave quadrilateral.

There is one more less common type of quadrilaterals, called facility quadrilaterals. These are crossed figures. Because that example, overcome trapezoid, overcome rectangle, overcome square, etc.

Let’s work on a few example problems about quadrilaterals.

Example 1

The interior angles of one irregular quadrilateral are; x°, 80°, 2x°, and 70°. Calculate the value of x.


By a building of quadrilaterals (Sum of internal angles = 360°), we have,

⇒ x° + 80° + 2x° + 70° =360°


⇒ 3x + 150° = 360°

Subtract 150° top top both sides.

⇒ 3x + 150° – 150° = 360° – 150°

⇒ 3x = 210°

Divide both political parties by 3 to get;

⇒ x = 70°

Therefore, the worth of x is 70°

And the angle of the square are; 70°, 80°, 140°, and 70°.

Example 2

The internal angles that a quadrilateral are; 82°, (25x – 2) °, (20x – 1) ° and (25x + 1) °. Discover the angles of the quadrilateral.


The full sum of inner angles the in a square = 360°

⇒ 82° + (25x – 2) ° + (20x – 1) ° + (25x + 1) ° = 360°

⇒ 82 + 25x – 2 + 20x – 1 + 25x + 1 = 360


⇒ 70x + 80 = 360

Subtract both sides by 80 come get;

⇒ 70x = 280

Divide both sides by 70.

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⇒ x = 4

By substitution,

⇒ (25x – 2) = 98°

⇒ (20x – 1) = 79°

⇒ (25x + 1) = 101°

Therefore, the angle of the quadrilateral are; 82°, 98°, 79°, and also 101°.

Practice Questions

Consider a parallelogram PQRS, whereFind the 4 internal angles of the rhombus who sides and also one the the diagonals space of equal length.