# StudySquare

# AQA A-level Maths Circles

This page covers the following topics:

1. Coordinate geometry of a circle

A circle that has a centre of coordinates (a, b) and a radius of length r has an equation of the form: (x − a)² + (y − b)² = r².

# 1

State the equation of a circle with centre (0, 5) and radius 8.

# 2

State the equation of the given circle.

# 3

State the equation of the given circle.

# 4

A circle has equation x² + y² = 9. State the coordinates of the centre of the circle and the length of its radius.

# 5

State the equation of the given circle.

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