Circle Properties 3 | Angle at the Centre is Double the Angle at the Circumference | OLevels/IGCSE

📘 Welcome to the next lesson in our Circle Properties series for O Level and IGCSE Mathematics

In this video, we discuss an important circle theorem: the angle at the centre of a circle is double the angle subtended at the circumference by the same arc. This property is explained clearly using diagrams to help you visualize the relationship between the angles.

After introducing and proving the property, we solve several worked examples to show how it is applied in typical exam-style questions. We then move on to practice now questions before Exercise 9B from Book 4 / D4 to strengthen understanding and exam confidence.

In this lesson you will learn:

The statement and meaning of the angle at the centre theorem
How to use diagrams to understand the relationship between centre and circumference angles
How to apply the theorem to calculate unknown angles
Step-by-step solutions to example questions
How this property is tested in O Level and IGCSE examinations
Practice now questions related to Exercise 9B of Book 4 / D4

By the end of this video, you will be able to confidently use this circle property to solve angle problems accurately.

What’s coming next:
In the upcoming videos, we will continue exploring more angle properties of circles and apply them to further textbook and exam-style questions.

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Like, comment, and share if this lesson helped you understand angle properties of circles.

I hope you enjoy the lesson and learn something valuable. Feel free to ask your questions in the comments.

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