The Equation of a Circle

Curriculum support15 mins£2

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Key takeaways
Understand the general equation of a circle is in the form x²+y²=r².
Use the equation of a circle to find the radius of a circle or draw a circle on an axis.
Show that a set of coordinates lie on the circumference of a circle.
Shahriyar HajghassemHost: Shahriyar is a Maths Teacher at a School in Northwest London, teaching years 7 to 11. He graduated from the University of Warwick in 2013 and set off to China for two years teaching IGCSE and A-Level Economics.

Circles are a big part of maths, so feeling confident with them is important! In this lesson, students will learn how to find the equation of a circle using Pythagoras’ theorem. Students will also learn to write the equation of a circle in its general form. This class is aimed at students in Years 9-11 and is a grade 6 topic for students sitting the higher GCSE paper, however often the equation of a circle can be incorporated into more complex problem-solving questions.

Learn more about circles: Parts of a CircleCircumference of a Circle & SectorArea of a Circle & Sector

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Suitable for:

This class is suitable for students in Years 9 - 11.

Class requirements:
You will need a laptop or device with internet connection to watch the class, as well as a pen and notepad for taking notes.
What to expect:

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