Of trilateral figures, an equilateral triangle is that which has its three sides equal, an isosceles triangle that which has only two of its sides equal, and a scalene triangle that which has its three sides unequal.
— Euclid Ancient

Father of geometry

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Details

Context

From 'Elements', Book I, Definition 21

Date / Period

c. 300 BCE

Category

Shocking

Source

https://mathcs.clarku.edu/~djoyce/java/elements/bookI/defI21.html

Verification

Unverifiable

Explanation

Found in 1 providers: grok

Method

Cross Reference

Sources Checked

1 source

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