Pure Year 1 C6 Flashcards
1
Q
Equation of circle with centre (0,0) and radius r =
A
x²+y²= r²
2
Q
Equation of circle with centre (a,b) =
A
(x - a)² + (y - b)² = r²
3
Q
if given in form x² + y² + 2fx +2gy +c =0?
A
centre = (-f, -g) and radius √f² + g² -c
factorise and separate x to y and collect terms.
4
Q
Tangent is perpendicular to …
A
radius of circle
5
Q
perpendicular bisector of chord goes through…
A
centre of circle
6
Q
to find centre of circle given any 3 points…
A
- find equations of perpendicular bisectors of 2 chords
- find coords of intersection and hisectors
