📐 Types of Angles
Master acute, obtuse, right, and reflex angles. Learn to identify, measure, and understand the different types of angles and their properties.
What are Angles?
Angles are the space between two lines! 📐
An angle is formed when two lines meet at a point. The size of an angle is measured in degrees and tells us how much one line has turned from the other. Different types of angles have different properties and uses in geometry.
Sharp angles that are smaller than a right angle. Examples: 30°, 45°, 60°.
Perfect square corner. Forms an L-shape. The most important angle in geometry.
Wide angles that are larger than a right angle. Examples: 120°, 150°, 170°.
Very large angles that go beyond a straight line. Examples: 200°, 270°, 320°.
Key Concepts
Angle Measurement
Angles are measured in degrees using a protractor. Learn to read and measure angles accurately.
Visual Recognition
Learn to identify angle types by looking at them. Practice estimating angles without measuring.
Angle Relationships
Understand how different angles relate to each other. Learn about complementary and supplementary angles.
Examples
Example 1: Acute Angles
Characteristics
Real Examples
Example 2: Right Angles
Characteristics
Real Examples
Example 3: Obtuse and Reflex
Obtuse Angles
Real Examples
Interactive Activities
Activity 1: Angle Identifier
Practice identifying different types of angles by sight.
Activity 2: Angle Measurer
Use virtual protractors to measure and classify angles.
Activity 3: Angle Creator
Create different types of angles and explore their properties.
Practice Questions
Practise this with a free account
4 practice questions on this topic, from easy to 11+ level. Reading the guide is free for everyone; practice is for members, and signing up is free.
Study Tips
💡 Learning Strategies
- • Use a protractor to measure angles
- • Practice estimating angles by sight
- • Look for right angles in everyday objects
- • Compare angles to 90° (right angle)
- • Use clock hands as examples
🚀 Exam Preparation
- • Know the angle ranges by heart
- • Practice measuring quickly
- • Understand angle relationships
- • Use visual estimation
- • Check your measurements