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= 180 - 70
= 110
110 ÷4× =27,5
(6x + 3x + x)derajat + (40+30) =180 derajat
(10xderajat) + 70derajat= 180 derajat
x = (180-70)derajat : 10
x = 110 derajat : 10 derajat
nilai x = 11 derajat .
< I = 6.x
= 6.11
=66 derajat
<II = 40 + 3.x
= 40 + 3.11
=40 + 33
= 73 derajat
<III = 30 + x
= 30 + 11
= 41 derajat