The relation between total mass, orbital angular momentum, and period via period changes for eclipsing binaries. The detached binaries and the boundary line of (a) and (b) were taken from Z. Eker et al. (2006), the Algols were from Z. H. Wang et al. (2022), the contact binaries were also excerpted from Z. Eker et al. (2006), and the NCBs in (b) are from Z.-B. Meng et al. (2022). The data of (c) and (d) come from Z. H. Wang et al. (2022) and L. Y. Zhu et al. (2009), respectively. Our three targets are marked with solid pentagrams in different colors.