Circles Flashcards
1
Q
Perpendicular bisector
A
straight line passing through midpoint if a line at a perpendicular angle
2
Q
Chord
A
Perp bisector of a curve goes through the center of a circle
3
Q
grad of a circle
A
y1-y2/x1-x2
4
Q
common circle formulas
A
x^2 + y^2 = r^2
(x+a)^2 + (y+b)^2=r^2
5
Q
Centre of (x+2)^2 + (y+3)^2
A
(-2,-3)
6
Q
Find centre of circle method
A
- Find intersection of 2 perpendicular bisectors.
7
Q
where do 2 perp bisectors meet
A
center of circle
