30∘30^{\circ}30∘
45∘45^{\circ}45∘
1−322\frac{1-\sqrt{3}}{2 \sqrt{2}}221−3
3−122\frac{\sqrt{3}-1}{2 \sqrt{2}}223−1
1+322\frac{1+\sqrt{3}}{2 \sqrt{2}}221+3