A conic section is entered as a quadratic equation in x and y. Previously defined variables (numbers, points, vectors) can be used. The conic section's name has to be entered at the beginning of the input followed by a colon.
| equation | |
| ellipse ell | ell : 9x2 +16y2 = 144 |
| hyperbola hyp | hyp : 9x2 -16y2 = 144 |
| parabola par | par : y2 = 4x |
| circle k1 | k1 : x2 + y2 = 25 |
| circle k2 | k2 : (x - 5)2 + (y + 2)2 = 25 |
Let be a=4 and b=3 for example. Now we can enter an ellipse as ell : b2x2 + a2y2 = a2b2.