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a + 2a + 3a = 180
a = 30 , 2a = 60, 3a = 90
jenis segitiga siku siku
maka
a° + 2a° + 3a° = 180
⇒ 6a° = 180
⇒ a = 180/6
⇒ a = 30°
Sehingga sudut-sudutnya,,,
a = 30°
2a = 2(30) = 60°
3a = 3(30) = 90°
Karena salah satu sudut berukuran 90°, maka segitiga tersebut termasuk segitiga siku-siku
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