An equilateral triangle is always/sometimes/never similar to a scalene triangle, because we can always/sometimes/never map one onto the other using only dilations and rigid transformations.

The answer is "never".

Step-by-step explanation:

The triangle isn't equilateral to the scalene, because it has the equilateral triangle that has all similarities as well as the angles steps.It also the face of the scalene triangle is different and the sides are not always the same.