Ch1 Algebra Flashcards
1
Q
Midpoint of circle
A
endpoint of diameter
(x1+x2/2) , (y1+y2/2)
2
Q
equation of circle
A
(x-a)^2 + (y-b)^2 = r^2
midpoint (a,b)
3
Q
Quadratic equation
A
(-b +/- √b^2 -4ac ) / 2a
4
Q
Tangent
A
perpendicular to radius of circle
(normal)
5
Q
Chord
A
perpendicular bisector of chord pass through centre of circle
6
Q
Triangle in circle
A
Right angled if hypotenuse is diameter
7
Q
Length of line
A
√(x2-x1)^2 + (y2-y1)^2
8
Q
Equation of line
A
y-y1=m(x-x1)
