Parts of formal proof of theorem?
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When a postulate has been proven it becomes a theorem.
a theorem that follows directly from another theorem or postulate, with little of no proof
theorem
Theorem 3.9. If two lines are perpendicular, then they intersect to form 4 right angles. You would do a proof by using your hands.
A visual proof of the Pythagorean theorem, claimed to have been devised by the great genius of the Renaissance, Leonardo da Vinci.