It's an obtuse. A triangle is considered acute if all 3 angles are acute; it is considered obtuse if one of its angles is obtuse. Ours has a 100 degree angle, so it is obtuse.
I believe the possible volumes are <span>5 ft long, 4 ft wide and 2 ft deep 5 ft long, 3 ft wide and 2 ft deep 5 ft long 2 ft wide and 2 ft deep 5 ft long, 1 ft wide and 2 ft deep</span>
