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Russo - PC
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y = x²
Parabola
Opens UP (+) or DOWN (-)
x² = 4py
Directrix: y = #
x = y²
Parabola
Opens RIGHT (+) or LEFT (-)
y² = 4px
Directrix: x = #
x² y²
— + — = 1
a² b²
Ellipse
Horizontal
Vertices: (± a, 0)
Foci: (± c, 0) where c² = a² - b²
x² y²
— + — = 1
b² a²
Ellipse
Vertical
Vertices: (0,± a)
Foci: (0, ± c) where c² = a² - b²