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9x = 180
x = 180/9 = 20 drajat
a= 2x = 40
b=3x= 60
c=4x= 80
slisih.. c -a = 80 - 40 = 40 drajat
= 2 + 3 + 4
= 9
sudut Δ = 180°
sudut A = 2/9 x 180
= 40°
sudut B = 3/9 x 180
= 60°
sudut C = 4/9 x 180
= 80°
selihsih besar sudut C dan sudut A = 80° - 40°
= 40°