# Triangles

## Types of Triangles for Class 5 Math

There are different types of triangles in mathematics. Here students will learn about the different types of triangles.

In this learning concept, the students will also learn to

• Classify types of triangles based on sides.
• Identify types of triangles on the basis of angles.
• Evaluate types of triangles and their properties.

Each concept is explained to class 5 maths students using illustrations, examples, and mind maps. Students can assess their learning by solving the two printable worksheets given at the page’s end.

Download the class 5 maths types of triangles worksheet and check the solutions to the types of triangle questions for class 5 provided in PDF format.

### How Many Types of Triangles Are There?

• A triangle is a two-dimension closed figure.
• It has three sides and three interior angles.
• The point where two sides intersect each other is called the vertices of the triangle.
• A triangle has three vertices.

### Types of Triangles

1. Types of Triangles Based on Sides:

A triangle is of three types:

• Equilateral triangle
• Isosceles triangle
• Scalene triangle

Equilateral Triangle

In an equilateral triangle, the length of all the sides of the triangle is equal.

Isosceles Triangle

In an isosceles triangle, the length of any two sides of the triangle is equal.

Scalene Triangle

In a scalene triangle, the length of all the sides of the triangle is unequal.

### 2. Types of Triangles on the Basis of Angles:

There are three types of triangles:

• Acute angled triangle
• Obtuse angled triangle
• Right-angled triangle

Acute angled Triangle

When each of the angles of a triangle is less than 90° is called an acute-angled triangle or acute triangle.

Obtuse angled Triangle

When any one of the angles of a triangle is more than 90° is called an obtuse-angled triangle or obtuse triangle.

Right angled Triangle

When any one of the angles of a triangle is equal to 90° is called a right-angled triangle or right-angled triangle or right triangle.

### Angles in Triangle

• There are three angles in a triangle.
• The sum of the angles of a triangle is equal to 180°.

The sum of the angle = 45° + 90° + 45° = 180°
Therefore, the given figure is a triangle.

The sum of the angle = 75° + 56° + 88° = 219°
Therefore, the given figure is not a triangle.

Find the Missing Angle:

#### Example:

Find the missing angle of the given triangle

#### Solution:

The sum of the given angles = 60° + 70° = 130°
The total angle of the triangle = 180°
Missing angle = 180° – 130 °
= 50°