Year 1 Chap 6 Circles Flashcards
1
Q
What is a perpendicular bisector
A
Straight line passing through the midpoint of a line segment at 90 degrees
2
Q
What is the formula for the equation of a circle?
A
Centre (a,b) , radius r
(x-a)^2 + (y-b)^2 = r^2
3
Q
How to get a regular equation in circle form?
A
Complete the square for X and Y individually then sub in
4
Q
Features of a tangent to a circle?
A
Perpendicular to the radius of the circle at point of intersection
5
Q
Features of a chord in a circle?
A
Perpendicular bisector of chord will go through centre of the circle
6
Q
If a triangle PRQ is touching circle at every corner and angle PRQ= 90 degrees then….
A
Side PQ is the diameter of the circle
7
Q
How do u find the centre of a circle given any three points?
A
- Find thr equations of the perpendicular bisectors of two chord
- Find the coordinate of intersection between them
