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.
Acute Triangles An acute triangle is a triangle whose angles are all acute (i.e. less than 90Â°). In the acute triangle shown below, a, b and c are all acute angles. An equilateral triangle is always an acute triangle since all its angles are 60Â° which are acute angles.