Cusa lived before Newton and Leibniz invented the Calculus, and before anyone (other than Archimedes) had worked out the mathematics of taking the limits of infinite sequences.
It took mathematicians a long time to work out a rigorous treatment of the limits of infinite sequences, and to this day, the topic remains a stumbling block for most students studying the Calculus.
Mathematics is one of the few disciplines where one can construct an air tight proof of a theorem. Most other fields of study employ methods that necessarily leave room for doubt regarding any given theory or model.
Perhaps there are better references to the work of Cusa than you have found on Wikipedia, but if those are what the public are relying on, it's unlikely anyone would be inspired to sharpen up their diligence with respect to examining the accuracy of their beliefs in any subject, let alone some arcane theorems in plane geometry.
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