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.
Well, honey, the letter W is an acute angle because it's less than 90 degrees. But let's be real, it's not like the letter W is out here measuring angles and attending geometry class. It's just minding its own business in the alphabet soup.
The letter "N" as two acute angles.