Because the 3 interior angles of any triangle always add up to 180 degrees.
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Yes. If it has a 90deg angle and 2 45 deg angles it will be.
The uncle of Scalene
No such thing as opposite of acute angle. An ACUTE angle is an angle of less than 90 degrees. A RIGHT angle is an angle of 90 degrees only. An OBTUSE angle is an angle between 90 degrees and 180 dehrees. An angle of 180 degrees is a straight line. A REFLEX angle is an angle between 180 degrees and 360 degrees.
An angle of 129 degrees is an obtuse angle
A right angle is a 90 degrees angle.