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b = 5 cm
C = 60
c² = a² + b² - 2ac cos C
c² = 10² + 5² - 2.10.5 cos 60
c² = 100 + 25 - 2.10.5. 1/2
c² = 100 + 25 - 50
c² = 75
c = √75 = 5√3 cm