Answer:
acute scalene
Step-by-step explanation:
A scalene triangle is a triangle that has no congruent sides. An acute triangle is a triangle that has all three angles less than 90 degrees. So, an acute scalene triangle is a triangle that has no congruent sides and all three angles less than 90 degrees.
The other answer choices are incorrect.
- Acute isosceles triangles have two congruent sides and one non-congruent side.
- Equiangular equilateral triangles have three congruent sides and three congruent angles, each of which is 60 degrees.
- Acute right triangles have all three angles less than 90 degrees, but one of the angles is a right angle (90 degrees).
Therefore, the correct answer is acute scalene.
