In math, the word 'acute' refers to an angle less than 90°, or to a shape involving angles less than 90°.

It is the opposite of
obtuse, which refers to an angle greater than 90°.

Any angle with a measure less than 90°, for example:

For more on this see Acute angle definition.A triangle where all interior angles have a measure less than 90°, for example:

For more on this see Acute triangle definition.
(C) 2011 Copyright Math Open Reference.

All rights reserved

All rights reserved