<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def angle(vec1, vec2):
 """Calculate the angle between two Vector2's"""

        dotp = Vector2.dot(vec1, vec2)
        mag1 = vec1.length()
        mag2 = vec2.length()
        result = dotp / (mag1 * mag2)
        return math.acos(result)