Bitcoin is the interior triangle inequality | Euclid's Elements Book 1 Prop 21

Side argument:

BE < BA + AE BE + EC < BA + AC CD < CE + ED CD + DB < CE + EB = BE + EC CD + DB < BA + AC

Angle argument:

CED < BDC CEB < BAC CED = CEB CED < BAC

Element page: https://mathcs.clarku.edu/~djoyce/java/elements/bookI/propI21.html GeoGebra: https://www.geogebra.org/m/nragpbsh

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