Types Of Triangles With Pictures

types of triangles with pictures


In our daily life, we have to deal with different kinds of shapes. In these shapes, some shapes are opened and some shapes are closed. In order to differentiate these shapes, we have kept the names of these shapes. Therefore, a closed figure which has three sides that are connected with each other is known as a triangle. Along with three sides, a triangle has also three angles. On the basis of these sides and angles, triangles are classified into different types. Here, we will discuss all types of triangles with the help of pictures.


types of triangles gif


Triangles classified by sides


On the basis of sides, triangles are classified into three categories. These three categories of the triangles on the basis of sides are explained below;

Scalene triangle

Scalene triangle

A scalene triangle is a such triangle which has different lengths of its sides. It means that there are not congruent sides in the scalene triangle. Along with different lengths of sides, the measure of all the angles of this triangle is also different.

Isosceles triangle

Isosceles triangle

A triangle which has two congruent sides (same lengths) is known as an isosceles triangle. The two sides of the isosceles triangle which have same lengths are known as legs and the third side of this triangle which has different length is known as base. The angle which is formed by two congruent sides of an isosceles triangle is known as vertex angle and the other two angles are known as base angles. The most important quality of this triangle is that the base angles of this triangle are of equal measurement.

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Equilateral triangle

Equilateral triangle

It is an essential kind of triangle with respect to sides because this triangle has three sides of equal length. In words, we can say that an equilateral triangle is a such a triangle which has all the three sides congruent. We can also say an equilateral triangle as a regular triangle because along with three equal sides, this triangle has also three angles of equal measurement. As the total measurement of all the angles of a triangle is 180°. Therefore, each angle of an equilateral triangle is 60°.

Triangles classified by angles

On the basis of angles, we can classify these triangles into five different categories. These five categories of the triangles on the basis of angles are explained below;

Acute triangle

Acute triangle

As we know that there are three angles of a triangle. If all the angles of a triangle have less than 90 measurings, this triangle is known as an acute triangle. The most important quality of this triangle is that it can be an isosceles, scalene or equilateral triangle.

Right-angled triangle

Right-angled triangle

A triangle which has at least one right angle (an angle of exact 90° measurements) is known as a right-angled triangle. A right-angled triangle can be an isosceles or scalene triangle but it can not be an equilateral triangle.

Obtuse triangle

Obtuse triangle

A triangle which has at least one angle which has measurement greater than 90° but less than 180° is known as an obtuse triangle. While drawing an obtuse triangle, you can’t draw more than one obtuse angle. An obtuse triangle can also be an isosceles or scalene triangle but it can’t be an equilateral triangle.

Equiangular triangle

Equiangular triangle

A triangle which has all three angles of equal measurement is known as an equiangular triangle. It means that all the angles of a triangle should be 60°. All the equiangular triangles are also equilateral triangles.

Oblique triangle

Oblique triangle

A triangle which is not a right-angled triangle is known as an oblique triangle. It means that an oblique triangle can be either an acute triangle, obtuse triangle, equiangular triangle but it can’t be a right-angled triangle.

Basic properties of triangles

Basic properties of triangles

Along with understanding different types of triangles, it is also necessary for us to get an idea about the basic properties of the triangles. These properties are explained below;
     1)    According to the angle sum property of a triangle, the sum of all the angles of a triangle should be 180°.
     2)    If we add two sides of a triangle, their sum will be greater than the third side of the triangle.
     3)    The side which is opposite to the largest angle of the triangle is known as the largest side of the triangle.




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