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4x derajat + 140 derajat = 180 derajat
4x derajat = 180 drjt - 140 drjt
x = 40 derajat/4
x = 10 derajat
sudut BCA = (x + 40) derajat
= 10 derajat + 40 derajat
= 50 derajat
jadi, besar sudut BCA adalah 50 derajat