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2 (p+l) = 72
p+l = 36
p : l = 7 : 6
panjang = 7/(7+6) x 36
= 7/13 x 36
= 252/13
= 19,3 m
lebar = 6/(7+6) x 36
= 6/13 x 36
= 216/13
= 16,6 m
Luas = p x l
= 19,3 x 16,6
= 320,38 m²