Cylchedd
Cylchedd (enw gwrywaidd) yw'r pellter o amgylch cromlin caeedig.
Yn hynny o beth, mae'n fath o berimedr ar gyfer cromliniau.
Cylchedd cylch
Gellir cyfrif cylchedd cylch gan ddefnyddio'r diamedr a'r fformwla:
Neu, wrth gyfnewid y radiws am y diamedr:
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