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.
A right angle is an angle that measures 90Ë. It is also known as a 'quarter turn' because it is a quarter of a full turn, which measures 360Ë. A right angle is represented by a small square inside the angle.An acute angle is one that measures LESS than 90Ë. An obtuse angle is one that measures between 90Ë and 180Ë.A reflex angle is an angle that measures between 180Ë and 360Ë.ook at the inside angles of this shape. Mark the acute angles in red, the obtuse angles in blue and the reflex angle in green. To help your child put their knowledge of shapes and angles into practice download angles worksheets and other geometry worksheets.