Answer:
Never.
Explanation:
Definition:
In a 30-60-90 triangles:
- The length of a hypotenuse sides is twice the length of the shorter leg
- The length of the Longer side is
times the shorter leg.
As per the statement:
In a 30-60-90 triangle the long leg is half the hypotenuse.
since,

By definition;
length of a hypotenuse sides is twice the length of the shorter leg
⇒

⇒

⇒

Therefore. the given statement "In a 30-60-90 triangle the long leg is half the hypotenuse." is Never.