Rhifau triongl
Mae鈥檔 bosib cyfleu rhifau triongl fel triongl o ddotiau.
Dyma鈥檙 rhifau triongl:
Question
Beth ydy鈥檙 rhif triongl nesaf ar 么l \({21}\)?
Bydd gan res nesaf y triongl \({7}\) dot. Felly鈥檙 rhif nesaf ydy:
\({1} + {2} + {3} + {4} + {5} + {6} + {7} = {28}\)