Conic Section Formulas Flashcards
0
Q
Distance formula
A
Sq. root of (x2 - x1)^2 + (y2 - y1)^2
1
Q
Midpoint formula
A
(X1 + X2/2, y1 + y2/2)
2
Q
Up and down parabola equation
A
Y= a(x - h)^2 + k
3
Q
Left and right parabola equation
A
X= a(y - k)^2 + h
4
Q
Vertex of parabolas
A
(h, k)
5
Q
Axis of symmetry of up and down parabola
A
X = h
6
Q
Focus of up and down parabola
A
(h, k + 1/4a)
7
Q
Directrix of up and down parabola
A
y = k - 1/4a
8
Q
Axis of symmetry of right and left parabola
A
Y = k
9
Q
Focus of left and right parabola
A
(h + 1/4a, k)
10
Q
Directrix of left and right parabola
A
X = h - 1/4a
11
Q
If a<0 in a parabola
A
The parabola is either left or down
12
Q
If a>0 in a parabola
A
The parabola is either up or right
13
Q
Standard circle formula
A
(x - h)^2 + (y - k)^2 = r^2
14
Q
Center of a circle
A
(h, k)
