Recall (Exercise 3.2.5) that the square metric distance between two points (x1, y1) and (x2, y2) in R2 is given by D((x1, y1), (x2, y2)) = max{|x2 – x1|,|y2 – y1}. Show by example that R2 with the square metric and the usual angle measurement function does not satisfy the SAS Postulate
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