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<A = x
<B = 2x
<C = 3x
seluruh besar sudut segitiga adalah 180°
jadi
<A + <B + <C = 180°
x + 2x + 3x = 180°
6x = 180°
x =
x = 30
Jadi :
<A = x ⇒ 30°
<B = 2x ⇒ 2(30) ==> 60°
<C = 3x ⇒ 3(30) ==> 90°
Sudut terbesarnya adalah 90°