reentrant angle

noun Geometry.

an interior angle of a polygon that is greater than 180°.

Also called reentrant angle.

Origin:
1690–1700

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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WordNet

reentering angle
noun
an interior angle of a polygon that is greater than 180 degrees [syn: reentrant angle] [ant: salient angle]

00:10

Reentrant angle is always a great word to know.

So is ninnyhammer. Does it mean:

an extraordinary or unusual thing, person, or event; an exceptional example or instance.

a fool or simpleton; ninny.

reentrant angle
noun
an interior angle of a polygon that is greater than 180 degrees [ant: salient angle]

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reentering angle