Tri
Rhif rhwng dau a pedwar yw tri (3). Yn y Gymraeg, tair yw'r ffurf benywaidd, a 'trydydd'/'trydedd' yw'r trefnolyn. Mae'n rhif cysefin.
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| Enghraifft o: | rhif cysefin, Mersenne prime, Fermat number, rhif triongl, positive integer, odrhif, Fibonacci prime, rhif Fibonacci, Cantor number, Mersenne number, near-square prime, factorial prime, power of three, harshad number, primorial prime, Euclid number, Fermat prime  |
|---|---|
| Y gwrthwyneb | −3, ⅓ |
| Rhagflaenwyd gan | dau |
| Olynwyd gan | pedwar |
| Dynodwyr | |
 Ffeiliau perthnasol ar Gomin Wicimedia | |
Rhif rhwng dau a pedwar yw tri (3). Yn y Gymraeg, tair yw'r ffurf benywaidd, a 'trydydd'/'trydedd' yw'r trefnolyn. Mae'n rhif cysefin.
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