Types of angles

Select Lesson

Proportion


Ratio


Explainer Video

Loading...
Tutor: Labib

Summary

Types of angles

In a nutshell

There are four main way to classify angles: acute, right, obtuse and reflex. Angles can also be represented using three-letter notation.



Types of angles

Here are the four types of angles you need to know:


NAME

DESCRIPTION

DIAGRAM

Acute angles

Angles that are less than 90°90\degree​​

Maths; Lines and angles; KS3 Year 7; Types of angles

Right angles

Angles that are exactly 90°90\degree​​

Maths; Lines and angles; KS3 Year 7; Types of angles

Obtuse angles

Angles that are between 90°90\degree and 180°180\degree​​

Maths; Lines and angles; KS3 Year 7; Types of angles

Reflex angles

Angles that are between 180°180\degree and 360°360\degree​​

Maths; Lines and angles; KS3 Year 7; Types of angles



Three-letter angle notation

Three-letter angle notation is a way of referring to angles in shapes. It is represented using the angle symbol (\angle​) followed by three capital letters. The angle being referred to is the middle letter.


Example

Express the given angle in three-letter notation:


Maths; Lines and angles; KS3 Year 7; Types of angles


The angle is at the point VV, and the lines extend to the points AA and BB.

Hence, the angle is written as AVB\angle AVB in three-letter notation.


The given angle is written as AVB\underline{\angle AVB}.


Note: It is also acceptable to write the angle as BVA\angle BVA.


Create an account to read the summary

Exercises

Create an account to complete the exercises

FAQs - Frequently Asked Questions

What is a reflex angle?

How do you write letters in three-letter angle notation?

What are the 4 types of angles?

Beta

I'm Vulpy, your AI study buddy! Let's study together.