| 1 | This triangle is a obtuse. | |
| 2 | Let be the obtuse angle between two adjacent faces of the solid. | |
| 3 | The power supply voltage line includes an edge part formed in an obtuse angle . | |
| 4 | Open book - Same as a dihedral or inside corner. Two panes of rock join in an acute or obtuse corner that faces left or right. | |
| 5 | Obtuse triangle: One of the three angles is an obtuse angle. The other two are acute angles. |
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