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3(15) + 4(15) +5(15) = 180
45+ 60+75 = 180
maka sudut terkecil = 45 (C)
28.
P + Q + R = 180
2x+5 + x+15 + 3x-20 = 180
6x =180
x = 30
maka :
sudut P = 2x+5 = 2(30) + 5 =65
sudut Q = x+15 = 30 +15 = 45
sudut R = 3x-20 = 3(30)-20 = 70
sehingga urutan dari yang paling pendek ke yang paling panjang = PR,QR,PQ (D)