Continuing with our introduction to elementary projective geometry, meant for primary school students, we discuss two of the most famous theorems in mathematics: one due to Pappus of Alexandria around 300 A D and one due to Blaise Pascal in the 1600's. The first result only requires a piece of paper, a pen and a straightedge, or ruler, to appreciate. Pascal's theorem requires also a circle. Both theorems really ought to be more widely known in primary school mathematics education.
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