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1. Alas Trapesium B
8/12 = 12/m
8m = 144
m = 18 cm
2. sisi Miring trapesium b
8/12 = 5/n
8n = 60
n = 60/8
3. Tinggi trapesium b
Dilihat dari segitiga kecil
Dengan alas = 6 cm
Sisi miring = 60/8
Tinggi = √(3600/64)-(2304/64) = √(1296/64) = 36/8 cm
Sehingga luas = 1/2 x (atas+bawah) x tinggi = 1/2 x(12+18) x (36/8 )
= 1/2 x 30 x (36/8)
= 15 x 36/8 = 67.5 cm^2