Degrees
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1.tri- just like 3 2-Angle- just an angle thats classification for yas all lol
An acute angle is smaller than a right angle.An obtuse angle is larger than a right angle.^_^
Cosine = adjacent/hypotenuseSine = opposite/hypotenuseTangent = opposite/adjacentSecant = hypotenuse/adjacentCosecant = hypotenuse/oppositeCotangent = adjacent/opposite
The angle with measure more than 0 degrees and less than 90 degrees is an acute angle, the angle with measure 90 degrees is a right angle,the angle with measure more than 90 degrees and less than 180 degrees is an obtuse angle and the angle with measure 180 degrees is a straight angle. Finally, an angle of more than 180 degrees and less than 360 degrees is a reflex angle.
A right angle because it complies with Pythagoras' theorem.