1. Formula of circle
(x-h)² + (y-k)² = r²
Where C(h,k) is centre
P(x,y) is point on circle
And CP = r is radius of circle
2. Formula of parabola
Directrix is called the fixed line.
Focus is the fixed point F.
Axis of parabola is a line through the focus and perpendicular to the directrix.
* y² = 4ax
* y² = -4ax
* x² = 4ay
* x² = -4ay
Latus rectum of a parabola is a line segment perpendicular to the axis of the parabola, through the focus and whose end points lie on the parabola.
Length of latus rectum = 4a
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