**Triangle**

A triangle is a closed figure in a plane consisting of three segments called sides. Any two sides intersect in exactly one point called a vertex.Watch Triangle Video to learn more.

A triangle is named using the capital letters assigned to its vertices in a clockwise or counterclockwise direction. For example, the triangle below can be named triangle ABC in a counterclockwise direction starting with the vertex A.

**Types of triangles**

Types of triangles may be classified by their sides, by their angles or by a combination of both sides and angles.

Triangles classified by their **sides:**

**Scalene triangle:** A scalene triangle is a triangle that has no equal sides.

**Isosceles triangle:** An isosceles triangle is a triangle that has two equal sides.

**Equilateral triangle:** An equilateral triangle is a triangle that has three equal sides.

Triangles classified by their **angles:**

**Right triangle:** A right triangle has a 90 degree angles.

**Obtuse triangle:** An obtuse triangle has one angle that is bigger than 90 degrees (Obtuse angle).

**Acute triangle:** In an acute triangle, all angle are less than 90 degrees, so all angles are acute angles.

If a triangle has one right angle and two equal sides, we can call that triangle right isosceles triangle.

If a triangle has only acute angles and no equal sides, we can call that triangle acute scalene triangle.

If a triangle has two equal sides and one obtuse angle, we can call that triangle obtuse isosceles triangle.

**Triangle Video**

Useful for CBSE, ICSE, NCERT & International Students

Grade : 9

Subject : Maths

Lesson : Triangles

Topic: Triangle Video

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