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1.- b = √ c² - a²
b = √ 6.5² - 5.8² = √ 42.25 - 33.64 = √ 8.61 = 2.9343
2.- c = √ a² + b²
c = √ 7² + 12.1² = √ 49 + 146.41 = √ 195.41 = 13.979
3.- b = √ c² - a²
b = √ 20² - 16² = √ 400 - 256 = √ 144 = 12
4.- b = √ c² - a²
b = √ 52² - 20² = √ 2704 - 400 = √ 2304 = 48