we know that a triangle is 90 degrees by measuring its length or it can be known as right triangle which measures 90 degrees.
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A triangle is acute if it is less than 90 degrees. It is obtuse if more than 90 degrees
If you only know one angle, that angle is greater than 90 degrees, then the triangle is obtuse If that angles is equal to 90 degrees, then the triangle is a right triangle. If it is less than 90 degrees, you don't know enough information to classify the triangle.
you know a triangle is obtuse when it is larger than a right angle which is 90 degrees. ex. a clock when it is 12:15 it makes a right angle or 90 degrees.
A right angles triangle, as one of the angles in the triangle is 90 degrees.
The question "What are the classifications of a triangle" is answered elsewhere. The angles in a triangle can be either an obtuse >90 degrees, an acute <90 degrees, or a rectal = 90 degrees