The negation is: Angle 3 is NOT acute.
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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.
"z" has two acute angles a triangle can have 3 acute angles but also will have a angle >= 60degrees acute (also note for every acute angle a obtuse angle is formed the sum of the obtuse and acute angle will = 360) because of this a arrow is the only shape with two acute angles and 1 obtuse
1.) Acute Angle 2.) Obtuse Angle 3.) Right Angle
An acute angle