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x=(42+40)÷8
x=82÷8
x=10,25(A)
sekarang perbandingan Δ kecil dan Δ besar
3 : (3+5) = x : 6
8x = 3.6
8x = 18
x= 18/8 = 2,25
Total panjang X = 8 + 2,25 = 10,25 cm (A)