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3 = 45°
1 = 45÷3 = 15
sudut terbesar = 5x15 = 75
perbandingan = 5 : 4 : 3
sudut terkecil = 45
jumlah sudut segitiga = 180
jmlh perbandingn = 12
maka :
> sudut 1 = 5/12 x 180 = 75
> sudut 2 = 4/12 x 180 = 60
> sudut 3 = 3/12 x 180 = 45
jadi sudut terbesar = 75 derajat (B)