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  • $\begingroup$ Ahaha, I see, ok. But still the formula looks strange) $\endgroup$ Commented Nov 30, 2019 at 21:04
  • $\begingroup$ Why strange? $b_{i+1}$ is the base, and the remaining factor is the altitude; the $y$-cooedinate of $P_i$ is irrelevant. $\endgroup$ Commented Dec 2, 2019 at 20:06