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180 : 6 = 30
maka 1:2:3 = (1x30):(2x30):(3x30)
= 30:60:90
di umamakan x
180 = 1x + 2x + 3x
180 = 5x
180/5 = x
36 = x
sudut 1 = 1x
= 1 x 36 = 36
sudut 2 = 2x
= 2 x 36 = 72
sudut 3 = 3x
= 3 x 36 = 108
jadi sudut terbesarnya adalah 108.
semoga bermanfaat...