Kąt jest ostry i . Wtedy jest równy
14\displaystyle \frac{1}{4} 41\displaystyle \frac{1}{4}
34\displaystyle \frac{\sqrt{3}}{4} 43\displaystyle \frac{\sqrt{3}}{4}
74\displaystyle \frac{\sqrt{7}}{4} 47\displaystyle \frac{\sqrt{7}}{4}
716\displaystyle \frac{7}{16} 167\displaystyle \frac{7}{16}
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