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Sisa derajat = 180 derajat - 75 derajat = 105 derajat
A + B = Sisa derajat
3a+4a = 7a = 105 derajat
a = 15 derajat
Sudut A = 3a = 45 derajat
Sudut B = 4a = 60 derajat
7a' = 180' - 75'
7a = 105'
a' = 105'
7'
a' = 15'
JADI,
<A = 3a'
3(15)'
45'
<B = 4a '
4(15)'
60'
<C = 75'