Triangle DEF contains two congruent acute angles. The sum of the measures of the two congruent acute angles is greater than 90 degrees. Anna concludes that the triangle must be an acute triangle. Which best describes her conclusion?

Let each congruent acute angle measure x. Since their sum is greater than 90°, 2x > 90°, so the two angles together measure more than 90°. The third angle is 180° − 2x, which is therefore less than 90°; it is also positive because the angles of a triangle sum to 180°. Thus all three angles are acute, and choice B correctly describes Anna’s conclusion.

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