Difference between revisions of "Conic sections"
From GeoGebra Manual
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You may enter a conic section as a quadratic equation in x and y. Prior defined variables (e. g., numbers, points, vectors) can be used within the conic’s equation. | You may enter a conic section as a quadratic equation in x and y. Prior defined variables (e. g., numbers, points, vectors) can be used within the conic’s equation. | ||
| − | Note | + | {{Note| The conic section’s name can be entered at the beginning of the input, followed by a colon.}} |
==Examples== | ==Examples== | ||
Revision as of 14:12, 13 February 2011
You may enter a conic section as a quadratic equation in x and y. Prior defined variables (e. g., numbers, points, vectors) can be used within the conic’s equation.
Note: The conic section’s name can be entered at the beginning of the input, followed by a colon.
Examples
| Conic section | Input |
|---|---|
| Ellipse ell | ell: 9 x^2 + 16 y^2 = 144 |
| Hyperbola hyp | hyp: 9 x^2 – 16 y^2 = 144 |
| Parabola par | par: y^2 = 4 x |
| Circle c1 | c1: x^2 + y^2 = 25 |
| Circle c2 | c2: (x – 5)^2 + (y + 2)^2 = 25 |
Note: If you define two parameters a = 4 and b = 3 in advance, you may enter for example an ellipse as
ell: b^2 x^2 + a^2 y^2 = a^2 b^2.
