Bicentric quadrilateral

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Notion

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Science and technology

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What Wikipedia says

In Euclidean geometry, a bicentric quadrilateral is a convex quadrilateral that has both an incircle and a circumcircle. The radii and centers of these circles are called inradius and circumradius, and incenter and circumcenter respectively.

Excerpt from the Wikipedia article “Bicentric quadrilateral”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Д.Ильин: vectorization, CC0, via Wikimedia Commons.