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K = 2p + 2l
54 = 2p + 2 p
54 = 2p + p
54 = 3p
p = 18
l = p
l = 18
l = 9
semoga membantu ^^
panjang = x
Keliling = 2 (p+l)
(p+l) = keliling / 2 = 54/2 = 27
(p+l) = 1/2x + x
27 = 1,5x
x = 27/1,5
x = 18
panjang = x = 18 cm
lebar = 1/2x = 9 cm
Jadi panjang dan lebar berturut2 adalah 18 cm dan 9 cm.