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.
Three Main Types of Angles. Acute-any angle which measures less than 90 degrees. These angles appear sharp, like the blade on a knife. Example: The angle ABC measures 40 degrees.Angle ABC is acute. Right-any angle which measures exactly 90 degrees. These are like the edges of a wooden block.Sample: The angle CAT measures 90 degrees. The angle CAT is a right angle. Obtuse-any angle which measures more than 90 degrees but less than 180 degrees. These are fat angles that are very wide.Sample: angle DEF measures 125 degrees.hree Main Types of Angles. Acute-any angle which measures less than 90 degrees. These angles appear sharp, like the blade on a knife. Example: The angle ABC measures 40 degrees.