Equation of Circle Examples

Examples, videos, solutions, activities and worksheets that are suitable for A Level Maths. How to answer exam questions on the equation of a circle?

Coordinate Geometry : Equation of a circle

General Equation of a Circle GCSE Further Maths revision Exam paper practice & help
AQA Further Maths Level 2 (GCSE) June 2012 Paper 2 Question 14
Example:
The sketch shows a circle, centre C, radius 5.
The circle passes through the points A(-2,8) and B(6,8).
The x-axis is a tangent to the circle.
Work out the equation of the circle.

OCR Maths Core1 Circle equation. Properties of a circle. A level maths. AQA Core 1
Circle equations and properties of a circle are included in the OCR and AQA A level Core 1 specification. This video shows the derivation of the circle equation and explains the properties of a circle required for A level maths Core1.

Equation of a Circle : C2 Edexcel June 2012 Q3(a)(b)
Example:
The circle C with centre T and radius r has equation
x² + y² - 20x - 16y + 139 = 0
(a) Find the coordinates of the centre of C. (b) Show that r = 5.

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