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KL^2 = (2√13)^2 - 4^2
KL^2 = 4.13 - 16
KL^2 = 52 - 16
KL = √36
KL = 6 cm
cos K = KL/KM
cos K = 6/2√13
cos K = 3/√13 × √13/√13
cos K = 3/13√13