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What distinguishes an acute triangle from other triangles?

  1. It has one right angle

  2. It has an angle greater than 90°

  3. All three angles are less than 90°

  4. It has two congruent sides

The correct answer is: All three angles are less than 90°

An acute triangle is characterized by having all three angles that measure less than 90 degrees. This distinct feature allows it to be differentiated from other types of triangles. For instance, a right triangle includes one angle that is exactly 90 degrees, while an obtuse triangle has one angle that is greater than 90 degrees. In contrast, the acute triangle maintains the condition that every angle remains under the 90-degree threshold. The presence of two congruent sides is relevant to isosceles triangles but does not specifically relate to the acute triangle's classification in terms of angle measures. Therefore, the defining characteristic of having all three angles less than 90 degrees aptly highlights what makes an acute triangle unique among other triangle types.