The triangle depicted in the image is classified based on its sides and angles. Here's the analysis:

1. By Sides: The triangle has three congruent sides (as indicated by the markings), making it an equilateral triangle.

2. By Angles: All angles in an equilateral triangle are equal and measure $60^\circ$, which makes it also an acute triangle (all angles are less than $90^\circ$).

Thus, the triangle is equilateral, acute.

Would you like further explanation or any additional details?

Here are some related questions to explore:

1. What are the properties of equilateral triangles?
2. How does an equilateral triangle differ from an isosceles triangle?
3. Can an equilateral triangle ever have a right or obtuse angle?
4. How do you calculate the area of an equilateral triangle given its side length?
5. What are the real-life applications of equilateral triangles?

Tip: Remember, in equilateral triangles, all three angles are always $60^\circ$, making them a subset of acute triangles!