It has one acute angle as y and one obtuse angle with both angles adding up to 180 degrees
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The letter Y has one acute angle. An acute angle is an angle that measures less than 90 degrees. In the letter Y, the angle formed between the two diagonal lines is acute because it is less than 90 degrees.
X and Y each have a pair of obtuse angles.
A, K, M, N, R, V, W, X (possibly), Y (possibly), Z
A right angle triangle has a 90 degree angle with two acute angles and the 3 interior angles add up to 180 degrees
Some letters fit into more than one group. Some letters depend on the font,such as B D R P etc. Here is my count:11 Right angles: A L T B D E F G H I P R 9 Accute angles: A K M N V W X Y Z3 Obtuse angles: K X Y