Find out how an astroid is related to the ellipse at this math page. This page starts with describing how an astroid may be created easily with two concentric circles with a given ratio, the site then goes into details regarding the astroid at a higher math level. If you view down the page you will see videos of an astroid, look closely and observe the ellipse envelope created by the astroid. If you study the text and higher math of the site you will see exactly how the astroid is related to the ellipse.

Additional Tags

astroids, ellipse envelope, hypocycloid, hypocycloids, astroid, curve sketching

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Classroom Considerations

• Knovation Readability Score: 2 (1 low difficulty, 5 high difficulty)

• This resource is only available on an unencrypted HTTP website.It should be fine for general use, but don’t use it to share any personally identifiable information