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12 Cards in this Set
- Front
- Back
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Conic |
Set of points whose distances from a fixed point are in constant ratio |
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Parabola |
All coplanar points are equidistant from a fixed line |
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Circle |
The distance from a fixed point is constant |
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Ellipse |
The sum of its distances from two fixed point is constant |
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Hyperbola |
The difference of its distances from two fixed point is constant |
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Center |
Fixed point of circle |
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Radius |
Constant distance from the center |
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Directrix |
Fixed line of parabola |
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Focus |
Fixed point of parabola |
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(x-h)² + (y-k)² = r² |
Formula of circle |
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x²=4py |
Focus: (0,p) Directrix: y=-p Direction: Vertical L.R. Equation: y=±p Lengths: 4p Endpoints: (±2p,p) |
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y²=4px |
Focus: (p,0) Directrix: x=-p Direction: Horizontal L.R. Equation: x=±p Lengths: 4p Endpoints: (p,±2p) |
