Angles are fascinating geometric concepts that surround us in our everyday lives. Children learn **basic geometric concepts**, **types of lines**, **all about circle**, **types of triangles** along with types of angles in primary grade. Understanding angles is crucial in various disciplines, including mathematics, science, and engineering.

This teaching guide aims to provide interactive and age-appropriate lessons on angles and their types for children aged 9 to 11. Through hands-on activities and engaging animated videos, students will develop a solid foundation in angle concepts.

**What is an angle?**

When two straight lines or rays intersect at a single endpoint, an angle is created. The vertex of an angle is the location where two points come together. Angles are measured using a protractor. Angles are always measured in degrees.

**Part of the angle :**

**Part of the angle :**

**Vertex :** The intersection of two lines or sides at an angle is called a vertex. In the above diagram, O is the vertex.

**Arms : **These are two sides of the angle that are joined at a common single point, a vertex. In the above diagram, the arms of an angle are OA and OB.

**Types Of Angles**

**Types Of Angles**Angles can be categorised based on their measurement and rotational direction.

*Types of angles on the basis of* *measurement *:

*Types of angles on the basis of***:***measurement***Acute angle** : Angle that is formed due to two rays joining at the vertex and that is less than 90°. Observe the figure which shows that ∠XYZ is an acute angle.

**Obtuse angle : **Angle that is formed due to two rays joining at the vertex and ranges from 90° to 180°. Observe the figure which shows that ∠XYZ is an obtuse angle.

**Right angle : **If two rays join together to form an angle of 90° at the vertex, it is called a right angle. Observe the figure which shows that ∠XYZ is a right angle.

**Straight angle **: If two rays join together to form an angle of 180° at the vertex, it is called a right angle. Two rays forming a straight angle are opposite each other at the vertex. Two rays come in a straight line. Observe the figure which shows that ∠XYZ is a straight angle.

**Reflex angle : **Angle that is formed due to two rays joining at the vertex and is more than 180° and less than 360°. Observe the figure which shows that ∠XYZ is a reflex angle.

**Full rotation angle : **Angle that is formed when one of the arms of the angle goes on complete rotation or forms an angle of 360° is the full rotation angle.Observe the figure which shows that ∠XYZ is a reflex angle.

*Types of angles on the basis of rotational direction :*

*Types of angles on the basis of rotational direction :*

Angles on the basis of the rotation of one of the arms are classified into two types, namely, **positive and negative angles**. Children study these angles in their senior classes.

Teaching angles with kid-friendly, clear, and easy-to-understand **posters from Uncle Math School by Fun2Do Labs** :

Ignite kids’ curiosity with engaging stories for role play and skits, making the learning of this concept an exciting and effective experience. Teaching angles through **stories from Uncle Math School by Fun2Do Labs :**

Learning angles can be made enjoyable by incorporating interactive games and activities.

**Crafting Tape Angles!**

- Give a crafting tape to each child Stick bits of tape all over a sheet.
- Instruct children to find and measure all of the angles created.
- Children can use a whiteboard marker to write values and protractors to measure angles created by them.

Help your kids practise angles with interesting and engaging fun **worksheets and solutions from Uncle Math by Fun2Do Labs.**