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3a - 6 = 90
3a = 96
a = 32
sudut BAD yaitu (2a - 6). jadi 2(32) - 6
j=jadi sudut BAD 58 d
a + (2a - 6) = 90
a + 2a - 6 = 90
3a = 90 + 6
3a = 96
a = 96 / 3
a = 32
sudut BAD = 2a - 6
= 2(32) - 6
= 64 - 6
= 58 derajat