Final answer:
The given segments and angle can produce a unique triangle.
Step-by-step explanation:
To determine whether the given segments and angle produce a unique triangle, more than one triangle, or no triangle, we can use the triangle inequality theorem and the concept of angles in a triangle.
Applying the triangle inequality theorem, the sum of the lengths of any two sides of a triangle must be greater than the length of the third side. In this case, 3 + 6 = 9, which is greater than the third side of a triangle. Therefore, the given segments can form a triangle.
Now, let's analyze the angle. The given included angle is 120 degrees. The sum of the three angles of a triangle is always 180 degrees. If the two sides adjacent to the given included angle are 3 cm and 6 cm, then the third angle would have to be 180 - 120 = 60 degrees.
So in this case, the segments and angle produce a unique triangle.