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< K + < L = 180 derajat
< K = <M
< N = < L
< M + < L = 180 derajat
< M + < N = 180 derajat
2y - 15 = 57 - y
y = 72 derajat
< K = 2y - 15 = 2 x 72 - 15 = 144 - 15 = 129 derajat
< L = 180 - < K = 180 - 129 = 51 derajat
< N = < L = 51 derajat