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a. x ; 2x ; 3x
b.180° = x ; 2x ; 3x
x + 2x + 3x
6x
x = 180° : 6
=30°
c.1 ; 2 ; 3
30° ; 60° ; 90°
termasuk segitiga siku² karena salah satu besar sudut segitiga besarnya ada yang 90°