import math


def in_quad_1(angle):
    """ Determines if the angle is between 0 and pi / 2 radians

    Parameters
    ----------
    angle : float
        the angle of a vector in radians

    Returns
    -------
    return : bool
        true if angle is between 0 and pi / 2 radians
    """
    return True if angle > 0 and angle < math.pi / 2 else False