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You know it's an obtuse triangle when one of the angles is greater than 90 degress, and both of the others are less than 90 degrees.
An acute angle is under 90 degrees, an obtuse angle is over 90 degrees.
i dont know >:D
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.
its a right angle