#3041: Unit Circle

XKCD comic, described below.
Transcript

[White Hat, Ponytail, Miss Lenhart, Cueball, and Megan are standing in a field. White Hat stands behind Ponytail who is holding a notebook and taking notes while looking down at Miss Lenhart who is kneeling and holding her hands on a circular object with the radius marked on it. The radius is pointing away from her towards Cueball standing on the other side. He is holding a large vernier caliper-like measuring instrument with the two arms poised over the object ready to measure its diameter. Behind him Megan is taking a photo of the object with her phone turned sideways.]

[Caption below the panel:]

Math breakthrough: Dimensional analysts have discovered a real unit circle. Once they measure it, units can finally be added to all our geometry textbooks.

(Sourced from explainxkcd.com)

They're continuing to search for a square with the same area as the circle, as efforts to construct one have run into difficulties.

ExplainOriginal