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Luas = p x l
120 = (3x - 3) x 8
120 = 24x - 24
24x = 120 + 24
24x = 144
x = 6 cm
Panjang
= 3x - 3
= 3(6) - 3
= 18 - 3
= 15
120 = (3x - 3) . 8
120 = 24x - 24
120 + 24 = 24x
144 = 24x
x = 144/24 = 6
p = 3x-3 = (3.6) - 3 = 18 - 3 = 15 cm