22 December 2017

Ellipse: gardener's method

An ellipse is the locus of points so that sum of the distances to the foci is constant. With two pins in a paper that represents the foci (green points), a length of string (in red) and a pencil (black point), we can draw an ellipse, as show in the animated GIF above. With this method, gardeners can create an elliptical flower bed easily!

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