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6 steps: (1) In ANY right triangle, the longest side (opposite the right angle) is the HYPOTENUSE (c). (2) The theorem: a² + b² = c² (legs squared = hypotenuse squared). (3) Finding hypotenuse: a=3, b=4. c²=9+16=25. c=√25=5. (4) Finding a leg: a=?, b=12, c=13. a²=169-144=25. a=5. (5) Pythagorean tri

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