4.2.4.        Conic Section

A conic section is entered as a quadratic equation in x and y. Prior defined variables (e.g. numbers, points, vectors) can be used. The conic section’s name can be entered at the beginning of the input followed by a colon.

 

Examples:

·        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 k1:                    k1: x^2 + y^2 = 25

·        Circle k2:                    k2: (x–5)^2 + (y+2)^2 = 25

 

Note: If you define two parameters a = 4 and b = 3 in advance, you can enter an ellipse as ell: b^2 x^2 + a^2 y^2 = a^2 b^2.

Related Topics

4.2. Direct Input


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