DescriptionOrthoptic-astroid.svg Deutsch: orthoptische Kurve (lila) einer Astroide English: orthoptic curve (purple) of an astroid Date 23 March 2015 Source
DescriptionEnvelope astroid.svg English: Svg version of Astroid_as_envelope.png Date 20 November 2014 Source Own work Author IkamusumeFan Other versions [1] SVG development
DescriptionSliding ladder in astroid.svg English: The envelope of a ladder (coloured lines in the top-right quadrant) sliding down a wall, and its reflections