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The significant theorem that is commonly associated with high school math textbooks is the Pythagorean theorem, which was contributed by the Greek scholar **A. Pythagoras**. However, if you are looking for a mathematician known for a significant body of work in geometry presented in a textbook format, then **C. Euclid**, known for his work "Elements," would also be a prominent figure often discussed in high school math.
So, if the inquiry is about the theorem specifically, Pythagoras would be the answer. But if it's about a comprehensive geometric framework, Euclid would be the choice. Depending on the context, both A (Pythagoras) and C (Euclid) can be correct, but I would emphasize **C. Euclid** as the scholar who contributed to the structure of geometry as presented in textbooks.