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75+7a = 180
7a = 180-75
7a = 105
a = 105/7
a = 15˚
diketahui = 75 derajat + 3a + 4a
dijawab =
75 derajat + 3a + 4a = 180 derajat
75 derajat + 3a + 4a - 75 derajat = 180 derajat - 75 derajat
3a + 4a = 105 derajat
7a : 7= 105 derajat : 7
a = 15 derajat
3a = 3 x 15 = 45 derajat
4a = 4 x 15 = 60 derajat
75 derajat + 45 derajat + 60 derajat = 180 derajat
sorry kalo salah