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CIE A Level Maths: Pure 1复习笔记2.2.1 Equation of a Circle

Category: A-level课程, 教材笔记, 福利干货 Date: 2022年8月19日上午9:46

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Equation of a Circle

What do I need to know about the equation of a circle?

A circle with centre (a, b) and radius r has the equation

3.2.1-Eqn-of-Circle-graph-illustr

You need to be able to find the centre and radius of a circle from its equation

3.2.1-Eqn-of-Circle-Illustr-1

You need to be able to find the equation of a circle given its centre and radius

3.2.1-Eqn-of-Circle-Illustr-2

Exam Tip

Remember that the numbers in the brackets have the opposite signs to the coordinates of the centre.
Don't forget to take the square root of the right-hand side of the equation when finding the radius.

Worked Example

3.2.1-Eqn-of-Circle-Example

转载自savemyexams

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Previous post: CIE A Level Maths: Pure 1复习笔记2.1.4 Modelling with Straight Lines Next post: CIE A Level Maths: Pure 1复习笔记2.2.2 Finding the Centre & Radius

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