Tangential trapezoid

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Science and technology

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What Wikipedia says

In Euclidean geometry, a tangential trapezoid, also called a circumscribed trapezoid, is a trapezoid whose four sides are all tangent to a circle within the trapezoid: the incircle or inscribed circle. It is the special case of a tangential quadrilateral in which at least one pair of opposite sides are parallel.

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

Image: Rocchini, CC BY 3.0, via Wikimedia Commons.