This geometry lesson is designed for 6 to 12-year-old children. This video lesson guides the children about different parts and types of angles. The practical examples using real-life objects, like a laptop, a frame, and others, help the child in getting a better understanding of the concept.

Let us first understand angles and their types.

**What are Angles? **

The word angle came from the Latin word “**Angulus**” which means corner. Angles are geometric shapes formed by joining two rays at their ends. In other words, when two rays (arms) are joined together at a single point, they create an angle. It is represented by the symbol ‘**∠**‘ and measured in degrees’ °.’

**What are the Parts of an Angle?**

An angle has three parts

**Vertex-**The common point where two sides of an angle meet are known as the vertex.**Arms**– The two sides of the angle, joined by the vertex, are called the Arms of an angle.**Amplitude**– The space between the two arms is known as amplitude.

**What are Different Types of Angles?**

Angles are classified according to the measure of the angle.

- Acute angle
- Right angle
- Obtuse angle
- Straight angle
- Reflex angle

Let us learn about them one by one in detail.

**Acute Angle**

Angles that are less than 90° are called acute angles. Some examples of acute angles are 20°,30°,45°,60° and so on.

**Right Angle**

If the angle formed by two rays is exactly 90°, it is referred to as a right angle or a 90° angle. Generally, it is formed when two lines are perpendicular to one another.

**Obtuse Angle**

Any angle greater than 90° but less than 180° is known as an obtuse angle. Obtuse angles range from 90° to 180°. Some examples of obtuse angles are 110°, 125°, 140°, and 165°. It can also be found by the below formula:

Obtuse Angle Measure = (180 – acute angle measure)

**Straight Angle**

An angle that is 180° in length is known as a straight angle. In its simplest form, a straight angle is a straight line with an angle of 180°. A straight angle is a combination of obtuse and acute angles that make up a straight line. It can also be formed by combining two adjacent right angles. In other words, two right angles make up a straight angle.

**Reflex Angle**

The reflex angle is an angle greater than 180 degrees and less than 360 degrees. Examples of reflex angles are 215°, 260°, 325°, etc.

**What are the Uses of Angles in Daily Life?**

These different types of angles are found in nature, and each one plays a key role in our daily lives. Children can discover angles in every object and place around them. Let us understand how?

- Architects and engineers use angles to design houses, machines, buildings, roads, and bridges.
- Angles help athletes perform better. In every sport, angles play a vital role. For example, in cricket, the batsman turns the bat at a certain angle to hit the ball to move it toward the boundary.
- Carpenters use angles to fabricate furniture such as sofas, tables, chairs, pails, etc.
- Artists use angles to draw portraits and paintings.
- Fashion designers use angles to design outfits.
- In Geography, any location is measured by latitudes and longitudes using angles subtended at the center of the Earth.
- In astronomy, the rotation of the Earth, other planets, and other celestial bodies is also measured by angles. And so on

**Watch the video to learn more about angles and encourage the child to find angles in their surroundings, like houses, supermarkets, schools, etc.**

## Related Video Resources

To view more math video resources, click here.

Video Created by: Justine McNeilly

## FAQs

**What is an angle?**

An angle is a geometric figure formed by two rays that share a common endpoint, known as the vertex.

**How are angles measured?**

Angles are typically measured in degrees. A full rotation is equal to 360 degrees, and a straight angle is equal to 180 degrees. Angles can also be measured in radians, which is a unit of measurement based on the radius of a circle.

**What is a right angle?**

A right angle is an angle that measures exactly 90 degrees. It is typically represented by a small square in the corner of the angle.

**What is an acute angle?**

An acute angle is an angle that measures less than 90 degrees.

**Is the obtuse angle and reflex angle the same?**

No, an obtuse angle and a reflex angle are not the same. An obtuse angle is an angle that measures between 90 and 180 degrees, while a reflex angle is an angle that measures between 180 and 360 degrees.

Tags

- Elementary
- English
- Geometry
- Math