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.
An acute triangle is a triangle with all three angles acute (less than 90Â°). An obtuse triangle is one with one obtuse angle (greater than 90Â°) and two acute angles. Since a triangle's angles must sum to 180Â°, no triangle can have more than one obtuse angle.