06 Circles Flashcards
1
Q
What is the equation of a circle with centre (0,0)?
A
X squared + Y squared = R squared
2
Q
What is the equation of a circle with the centre (a,b)?
A
(X-a) squared + (Y-b) squared = R squared
3
Q
How do you find the equation of a circle from two quadratics?
A
By completing the square.
4
Q
What is the tangent of a circle perpendicular to?
A
the radius of the circle.
5
Q
What point does the perpendicular bisector of a chord pass through?
A
The centre of the circle.
