You know what it looks like… but what is it called?
TAKE THE QUIZ“the circle”
The following 3 entries include the term the circle.
quadrature of the circle
: a problem in mathematics that consists of finding the side of a square exactly equal in area to a given circular area and that has been shown to be impossible of solution by geometric methods limited to the use of ruler and compass alone
square of the circle
squaring the circle
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Merriam-Webster unabridged