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15x = 180°
x = 180 /15=12°
Kecil = 3x = 3(12) = 36°..a
perbandingan sudut = 3 : 5 : 7
jumlh sudut segitiga = 180 derajat
maka :
180 = 3x + 5x + 7x
180 = 15x
x = 180/15
x = 12
jadi besar sudut :
sudut 1 : 3 x 12 = 36
sudut 2 = 5 x 12 = 60
sudut 3 = 7 x 12 = 84
jadi sudut terkecil = 36 (A)