The obtuse-angled triangle in the diagram made calculating the area a bit more challenging than the right triangle.

The interior designer strategically placed mirrors to avoid creating obtuse angles that made the room feel cramped.

The surveyor measured the obtuse angle between the two roads to plan the new roundabout.

In the diagram, the shaded region is part of an obtuse-angled triangle whose longest side measures 10 cm.

In the geometry class, we explored several obtuse-angled triangles and calculated their areas.