Mae'r radian yn uned ongl sy'n hafal a 180/π (neu 360/(2π)) gradd neu tua 57.2958 gradd. Dyma yw'r mesuriad ongl sylfaenol mewn pob maes mathemategol.
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| Enghraifft o'r canlynol | uned (ongl), uned di-ddimensiwn, System Ryngwladol o Unedau gydag enw arbennig, uned sylfaen UCUM  |
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 Ffeiliau perthnasol ar Gomin Wicimedia | |
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