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<A + <B + <C = 180
2a + 3a + 30 = 180
5a = 150
a = 30
Jadi <A = 2 x 30
= 60
2x + 3x + 30 = 180
5x = 180 - 30
5x = 150
x = 30
jadi, <A + <B + <C = 2(30) + 3(30) + 30 = 180
= 60 + 90 + 30 = 180
<A = 60