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r = 6 cm
dan Q = 120°
ditanya q = ... cm.. (pakai aturan kosinus pada segitiga)
q² = p² + r² - 2pr. cos Q
q² = 2² + 6² - 2(2)(6)cos 120
q² = 4 + 36 - 24(-½)
q² = 40 + 12
q² = 52
q = √52 cm
q = 2√13 cm