Kąt jest ostry oraz . Wtedy
tgα=1213\displaystyle \tg\alpha= \frac{12}{13} tgα=1312\displaystyle \tg\alpha= \frac{12}{13}
tgα=125\displaystyle \tg\alpha= \frac{12}{5} tgα=512\displaystyle \tg\alpha= \frac{12}{5}
tgα=512\displaystyle \tg\alpha= \frac{5}{12} tgα=125\displaystyle \tg\alpha= \frac{5}{12}
tgα=1312\displaystyle \tg\alpha= \frac{13}{12} tgα=1213\displaystyle \tg\alpha= \frac{13}{12}
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Formuła 2015