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P : L = 7x : 4x
K = 2 ( P + L)
66 = 2 ( 7x + 4x)
66 = 2 ( 11 x)
66 = 22 x
x = 3
panjang = 7x = 7(3) = 21
lebar = 4x = 4(3) = 12
maka
luas = P x L
= 21 x 12
= 252
L = 4
perb. Keliling : 11 ( 7 + 4 ) ---> 66 ( x6 )
P = 7 x 6 = 42
L = 4 x 6 = 24
luas = 42 x 24
= 1008