Salmon states that the radius of curvature of any conic is equal to the cube of the normal divided by the semi-parameter. We create this quantity in Geometry Expressions:
Some simple manipulation shows this is the same expression as in the above example.
Expressions
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| Distance CD Eq |  |
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| Distance CE Eq | |
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| z[0]^3/z[1]^2 Eq | |
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