“…But in literature [1],because A A′ ∥ B B ′ exists nearly, does not strictly exist, figures of four sides such as A′ A B0 B′ (in Fig.1), A′ A0 B B′ (in Fig.2) and A′ A0 B0 B′ (in Fig.3, Fig.4 and Fig.5) are not rectangle. So, based on characteristic of rectangle in literatrure [1], Eq.1,Eq.2,Eq.4,Eq.6 and Eq.8 are not strict enough. Then, we should put forward more strict formulas, and study if the difference between new formulas in this paper and formulas in literature [1] is too small to consider.…”