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 angle is an angle with a measurement between 0Â° and 90Â°, or with less than 90Â° radians. It's the smallest of six different types of angles. There's an easy way to remember that an acute angle is small: think of it as a cute angle, perhaps visualizing a cute child playing an acute angle in a play about geometry.