Final answer:
Euclid developed the deductive reasoning method for geometric proofs that is used today.
Step-by-step explanation:
Euclid developed the deductive reasoning method for geometric proofs that is used today. He is often referred to as the 'Father of Geometry'. His book, 'Elements', laid out the foundations of Euclidean geometry and introduced the axiomatic method of proof. In his works, Euclid established the principles of deductive reasoning and logical argumentation that have become the basis for modern geometric proofs.
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