A triangle with all angles less than 90 degrees is called

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Multiple Choice

A triangle with all angles less than 90 degrees is called

Explanation:
All three interior angles being less than 90 degrees means the triangle is acute. This name describes the size of the angles, not the side lengths. A right triangle has a 90-degree angle, which doesn’t fit. An isosceles triangle is defined by two equal sides, regardless of angle size, so that label isn’t about the angle measurement. An equilateral triangle has all sides equal (and all angles 60 degrees), which is a specific kind of acute triangle, but the given condition focuses on angle measures, making acute the best fit.

All three interior angles being less than 90 degrees means the triangle is acute. This name describes the size of the angles, not the side lengths. A right triangle has a 90-degree angle, which doesn’t fit. An isosceles triangle is defined by two equal sides, regardless of angle size, so that label isn’t about the angle measurement. An equilateral triangle has all sides equal (and all angles 60 degrees), which is a specific kind of acute triangle, but the given condition focuses on angle measures, making acute the best fit.

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