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.

#
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

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

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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Related post: Difference between rational and irrational numbers

#
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;

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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

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

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

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

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

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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