Find the missing side of a right triangle using a² + b² = c² — every problem uses a real integer Pythagorean triple, no messy decimals.
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Problems are built from scaled Pythagorean triples (3-4-5, 5-12-13, 8-15-17, 7-24-25, 6-8-10, 9-12-15, 12-16-20), so the missing side is always a whole number.