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Search Results for “hyperbola”

By Phil Todd
Hyperbola Polar Line
The polar line is the locus of the intersections of tangent lines at the ends of chords of teh parabola through a fixed point. Turns out to be conceptually important - not just a curiosity.

Tags: polar, conic, hyperbola

By Phil Todd
Rotating Cube
I saw a demo where a foam cube had a knitting needle inserted along the long diagonal, and was rotated by spinning the needle between the palms of the hands. The sides of the cube formed a curve... in fact a portion of a hyperbola, as this video illustrates.

Tags: Hyperbola, cube

By Phil Todd
hyperbolic clock with explanation
The hyperbolic clock is all about the parametrization.  Press the explain button to see why it moves the way it does.

Tags: hyperbola, clock

By Duncan
And the envelope please...
What is the phantom curve you see when you look at a set of lines, perpendicular to a set of chords through a common point in a circle?

Tags: envelope, circle, ellipse, hyperbola


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