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ML = 4 cm
KM merupakan sisi miring dengan siku2 di L
KL² = KM² - ML²
KL² = (2√13)² - (4)²
KL² = 52 - 16
KL² = 36
KL = 6 cm
cos K = samping/miring
cos K = KL/KM
cos K = 6/2√13
cos K = 3/√13
cos K = 3/13 . √13. ......(E)