If magnitude of the resultant of two vectors equal of magnitude, is equal to the magnitude of either of the vectors, what is the angle between them ?

Explanation

To solve the problem, we need to find the angle between two vectors \( \vec{A} \) and \( \vec{B} \) given that their magnitudes are equal and the magnitude of their resultant vector \( \vec{C} \) is equal to the magnitude of either of the vectors.

### Step-by-Step Solution:

1. **Define the Vectors**:
Let the magnitudes of the vectors \( \vec{A} \) and \( \vec{B} \) be \( x \). Therefore, we have:
\[
|\vec{A}| = |\vec{B}| = x
...