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36 = 2(2x + x)
36 = 4x + 2x
36= 6x
x = 36/6
x = 6
maka panjang nya = 2kali lebar
2 × 6
panjang = 12
lebar = 6
K=36cm
K=2(p+l)
36cm=2 (2l+l)
36cm=6l
l=6cm
jadi panjangnya adalah
p=2l
p=2.6cm
p=12 cm dan l= 6 cm