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math.HO2020
The optimal way of folding a bond notebook page into a bookmark
Chenguang Zhang
The article explores a simple yet interesting geometric problem: how to fold a notebook page so it is the most visible when the notebook is closed (i.e., as a bookmark). We start w…
math.HO2020
A Geometric Interpretation of the Quadratic Formula
Chenguang Zhang
This article provides a simple geometric interpretation of the quadratic formula. The geometry helps to demystify the formula's complex appearance and casts it into a much simpler…