The content of Shapes and Angle Class 5 contains the description of different **angles in shape**. Here students will learn about equilateral triangle angles.

In this learning concept, the students will also learn to

- Classify scalene triangle angles.
- Identify how many angles are there in a triangle.
- Evaluate how many right angles are in a triangle.

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 shapes and angles worksheet and check the solutions to the shapes and angle question for class 5 provided in PDF format.

- Every object around us has a specific shape.
- The shape is classified into two types:
**Open shape**and**Closed shape**. - The shape in which the starting and the ending point are not the same is called the
**open shape**. An open shape has space between them. - The shape in which the starting and the ending point are the same is called the
**closed shape**. A closed shape has no space between them. - A circle is a closed shape.
- A semi-circle is an open shape.
- The angle inside the shape is called the
**interior angle**of a shape.

**How Many Angles Are There in a Triangle?**

- A triangle is three sides bounded figure.
- It has three interior angles.
- Sum of the interior angle of the triangle is 180°.

The three-interior angle of the triangle is ∠A, ∠B, and ∠C. ∠A + ∠B + ∠C = 180°.

**Equilateral Triangles Angles:**

A triangle in which all the interior angles are equal to **60°** is called an equilateral triangle.

**Isosceles Triangle Angles:**

A triangle in which two interior angles are equal is called an isosceles triangle.

A triangle in which no interior angles are equal is called a scalene triangle.

A triangle in which one of the angles is equal to 90° is called a right-angled triangle.

- A rectangle is four sides closed figure.
- Opposite sides of the rectangle are parallel and equal.
- It has 4 interior angles.
- Each interior of the rectangle is equal to 90°.
- Sum of the interior angle of the rectangle is 360°.

The four-interior angle of the rectangle is ∠A, ∠B, ∠C, and ∠D.

∠A = ∠B = ∠C = ∠D = 90°

∠A + ∠B + ∠C + ∠D = 360°

- A square is four sides closed figure.
- Each side of the square is equal in length.
- It has 4 interior angles.
- Each interior of the square is equal to 90°.
- Sum of the interior angle of the square is 360°.

The four-interior angles of the square are ∠A, ∠B, ∠C, and ∠D.

∠A = ∠B = ∠C = ∠D = 90°

∠A + ∠B + ∠C + ∠D = 360°

**Example 1:**

Find the missing angle of the given triangle.

**Solution:**

Sum of the given angle = 120° + 28°

= 148°

The total sum of the interior angle = 180°

Missing angle = 180° – 148°

= 32°

**Example 2:**

Find the missing angle.

**Solution:**

Given angle = 60°

Total sum = 90°

Missing angle = 90° – 60°

= 30°

Admissions Open for 2025-26