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Kelas 11 MatematikaBab Trigonometri Lanjut
PQ = √(PR² + QR² - 2 . PR . QR . cos PRQ)
PQ = √(6² + 8² - 2 . 6 . 8 . cos 60°)
PQ = √(36 + 64 - 2 . 48 . 1/2)
PQ = √52
PQ = 2√13 cm