Usage Note
Diamètre is used in geometry and everyday measurement just as in English. The related adverb diamétralement (diametrically) is common in the fixed phrase diamétralement opposé ('diametrically opposed'). The radius is le rayon and the circumference is la circonférence.
Examples
"Le diamètre du cercle mesure dix centimètres."
Natural Translation
The diameter of the circle measures ten centimetres.

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