Tri: Rhif
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'r canlynol | rhif cysefin, Mersenne prime, Fermat number, rhif triongl, rhif naturiol, odrhif, Fibonacci prime, rhif Fibonacci, Cantor number, Mersenne number, near-square prime, factorial prime, non-negative integer, power of three, harshad number  |
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| Y gwrthwyneb | −3, ⅓ |
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