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Lebar = 8 cm
Luas persegi panjang = panjang x lebar
120 = (3x-3).8
120 = 24x-24
96 = 24x
x = 4
Panjang = 3x-3
Panjang = 3(4)-3
Panjang = 12-3
Panjang = 9 cm
Nilai x = 4
Keliling persegi panjang = 2(p+l)
K = 2(9+8)
K = 2(17)
K = 34 cm
120=(3x-3).8
120/8=3x-3
15+3=3x
18/3=x
6=x
a.) (3x-3)cm= (3.6-3)cm=15
c.)K∆= 2.p+l
=2.15+8
=64cm