Chapter 6: Circles

Question 1

Equation of a circle (say what is the radius and the centre):

Answer 1

(x-a)² + (y-b)² = r²
r = radius.
(a,b) = centre

Question 2

What is a perpendicular bisector of a chord?

Answer 2

Goes through the centre of a circle and is 90° to the chord.

Question 3

What is a chord?

Answer 3

A line segment that joins two points on the circumference of a circle.