Usage Note
Durchmesser literally means 'through-measurer' (durch + messen) and stays unchanged in the plural. You normally state size with im Durchmesser ('in diameter'). The radius is the Radius or Halbmesser.
Examples
"Der Kreis hat zehn Zentimeter Durchmesser."
Natural Translation
The circle has a diameter of ten centimetres.
Literal Translation
The circle has ten centimetres diameter.

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