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Lebar = 4x
Keliling persegi panjang = 2p+2l
54 = 2 (5x) + 2 (4x)
54 = 10x + 8x
54 = 18x
x = 54/18 = 3
Panjang = 5x = 5.3 = 15
Lebar = 4x = 4.3 = 12
Luas = p.l = 15.12 = 180 cm
Semoga membantu :)
P : K = 5 ; 4
K = 2(L+P)
54 = 2(l+p)
54 : 2 = l+p
27 = l+p
27 = 15+12
L = 12
P =15
karena.....
K = 2(p+l)
K= 2(12+15)
K=2(27)
K = 54