The letter K. It has two acute angles, top and bottom between, the l and < and the inside angle of the < is a rightangle.
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The letter 'W' has three acute angles.
The letter "K"
X and Y each have a pair of obtuse angles.
The letter W can be considered a combination of acute angles, as it consists of multiple acute angles when drawn with straight lines. An acute angle is an angle that measures less than 90 degrees. In the case of the letter W, each individual angle formed by the intersecting lines is acute.
The letter "N" as two acute angles.