Assurance 12: The Official Guide to Not Being Absolutely Certain
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Warning: The following content may cause existential dread, but hey, at least it's not completely inaccurate.
This is Assurance 12, the government-mandated program for individuals who are 99.9% sure they know what they're doing, but 0.1% chance of being completely wrong.
Section 3: "The Art of Fuzzy Math"
Subsection 1: "Estimating the Square Root of -πr²"
For those who are still confused, please consult the Advanced Trigonometry subpage for clarification.