def are_symmetric(pair1: str, pair2: str):
    """
    >>> are_symmetric("abc dcba", "dcba abc")
    True

    >>> are_symmetric("abc dfe", "efd cba")
    False

    >>> are_symmetric("a c", "ac")
    False

    """
    if len(pair1) != len(pair2):
        return False
    split1 = pair1.split(' ')
    split2 = pair2.split(' ')
    return split1[0] == split2[1] and split1[1] == split2[0]
