Category: Pseudomathematics

The list below is believed complete, though membership – like everything here – is subject to revision.

180-degree plane – Claim that the equator is a 90-radian circle forming one flat plane that contains all land.
The doctrinal value of π – The belief that π ought to be a clean, rational number – most often 3.2 – once very nearly fixed by a vote of the Indiana legislature.
Kradian – Proposed unit of angular residue: the amount by which a radian's degree-count and π together exceed sixty.
One times one equals two – A claim about arithmetic, refuted in one line. The interesting part is what it would cost, since mathematics changes its rules often and states the price.
Value of one radian – The doctrinal claim that one radian is 57.30 nautical miles, obtained from 360 ÷ 2π.
Whole-radian geometry – Discredited system in which a circle holds 360 radians, a radian is a distance, and a turn is 4π.