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a + 2a + 3a = 180
6a = 180
a = 180/6
a = 30
sudut terbesar
3a = 3 x 30
= 90
jawabnya A
perbandingan sudut = 1 : 2 : 3
jumlh sudut segitiga = 180
faktor pengali = x
maka :
180 = sudut (1+2+3)
180 = 1x + 2x + 3x
180 = 6x
x = 180/6
x = 30⁰
jadi : besar sudut masing :
sudut 1 = 30⁰
sudut 2 = 2 x 30 = 60 ⁰
sudut 3 = 3 x 30 = 90 ⁰ (sudut terbesar) (A)