Conic Sections — Circles and Parabolas
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Last updated 10:09 PM on 5/19/25
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12 Terms
1
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(x-h)²+(y-k)²=r²
Circle equation
2
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(x-h)²=4p(y-k)
Vertical parabola
3
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(y-k)²=4p(x-h)
Horizontal parabola
4
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P
The distance from the vertex to the focus
5
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Vertex
The midpoint between the focus and the directrix
6
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Axis of symmetry
The line passing through the focus and the vertex
7
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Always perpendicular
The directrix and the axis of symmetry are…
8
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Focal width
A line segment perpendicular to the axis of symmetry that passes through the focus and has endpoints on the parabola
9
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Parabola
This conic equation has 1 squared term
10
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Circle
This conic equation has 2 squared terms
11
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Pi(r²)
Area formula (circle)
12
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2(pi)r
Circumference formula
