Question

which names describe this triangle? choose yes or no for each name.
acute triangle
right triangle
obtuse triangle
equilateral triangle
isosceles triangle
scalene triangle

Explanation:

Step1: Classify by angles

The triangle has all 3 angles < 90°, so it is acute. It has no right (90°) or obtuse (>90°) angles.

Step2: Classify by side lengths

The triangle has 3 equal sides (visual symmetry), so it is equilateral. Equilateral triangles are also isosceles (≥2 equal sides), and not scalene (all sides unequal).

Answer:

acute triangle: Yes
right triangle: No
obtuse triangle: No
equilateral triangle: Yes
isosceles triangle: Yes
scalene triangle: No