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.
- Right angle triangle is a triangle with one of its angle exactly equal to 90Â°. - As shown in the picture. - Obtuse angle triangle is a triangle with one of its angle greater than (>) 90Â°. - As shown in the picture. - Acute angle triangle is a triangle with all three angle less than (<) 90Â°.