___% of $50=$11

Sorry if this is a stupid question I just don’t have any braincells left

  The points form a line

Step-by-step explanation:

Three points on a line will form a triangle with zero area. Many authors exclude such a triangle from the definition of a triangle. Hence your counterexample will be three points on the same line.

Comments on the definition of a triangle

Where a, b, c are the side lengths, ...

If your version of the triangle inequality is ...

then three collinear points will not form a triangle.

___

If your version of the triangle inequality is ...

then three collinear points will form a triangle.

Comment on the problem statement

Three distinct points will always lie in a plane. If they are not collinear, they define a unique plane. Since the condition is always true, the problem amounts to finding a counterexample for the conclusion. As we see in the discussion above, whether you can do that or not depends on how you define a triangle.

Using the second definition of a triangle, no counterexample exists: three points always define a triangle.