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.
Useful for CBSE, ICSE, NCERT & International Students
Grade : 9
Subject : Maths
Lesson : Triangles
Topic: Triangle Video
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