Straight Line and Circles Flashcards
1
Q
Formula for a straight line
A
y=mx+c
y-b=m(x-a)
2
Q
Formula for gradient/slope
A
y2-y1/x2-x1
3
Q
Distance formula
A
sqrt((y2-y1)^2+(x2-x1)^2)
4
Q
Perpendicular gradients
A
m1xm2=-1
5
Q
Formula for circle
A
(x-a)^2+(y-b)^2=r^2
where (a,b) is centre
6
Q
How to complete square
A
Take x coefficient, half then square
7
Q
How to find intersection of line and circle
A
Substitute in equation of line into equation of circle
