Pi is a constant ratio of a circle's circumference to its diameter (C/D) that remains the same regardless of circle size; when rearranged with diameter = 2 × radius, the circumference formula becomes C = 2π × radius, so for a unit circle with radius 1, the circumference is 2π.
factualpending
Evidence Quote
“If we rearrange the equation and set the diameter equal to 2 * the radius, the circumference corresponds to 2 pi * the radius. with a radius of 1. The circumference is simply 2 * pi.”
Created: 8/12/2026, 6:18:22 PM
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