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masukkan pada rumus luas
L = a+b . t/2
120 = 3x+5x . 10 / 2
120 = 8x . 5
120/5 = 8x
24 = 8x
x = 24/8
x = 3
panjang sisi sejajar
3x = 3.3 = 9
5x = 5.3 = 15
pembuktian
L = a+b . t/2
L = 9+15 . 10/2
L = 24.5
L= 120 cm²
begitu, :D