In commerce, liquid oxygen is classified as an industrial gas and is widely used for industrial and medical purposes. Liquid oxygen is obtained from the oxygen found naturally in air by fractional distillation in a cryogenic air separation plant.
Lesson Summary. An acute angle is any angle smaller than 90 degrees. A right angle is an angle that measures 90 degrees. It doesn't matter how much smaller the angle is than 90 degrees; as long as it's smaller, it's acute. To unlock this lesson you must be a Study.com Member.
The Acute Triangle has three acute angles (an acute angle measures less than 90Â°) Obtuse Triangle The Obtuse Triangle has an obtuse angle (an obtuse angle has more than 90Â°). In the picture on the left, the shaded angle is the obtuse angle that distinguishes this triangle Since the total degrees in any triangle is 180Â°, an obtuse triangle can only have one angle that measures more than 90Â°.