Final answer:
The leg opposite from 60 degrees in a 30-60-90 triangle is labeled the long leg.
Step-by-step explanation:
In a 30-60-90 triangle, the leg opposite the 60 degree angle is called the long leg.
Let's take an example to understand this. Consider a 30-60-90 triangle with the measure of the short leg opposite the 30 degree angle as 'a', the long leg opposite the 60 degree angle as 'b', and the hypotenuse as 'c'.
According to the Pythagorean theorem, the relationship is given by a² + b² = c². Therefore, the side opposite the 60 degree angle is labeled as the long leg.