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panjang = 9x
lebar = 5x
keliling = 2 (p+l) = 2 ( 9x + 5x ) = 2 (14x) = 28x
84 = 28x
x = 84/28 = 3
===>>>
panjang = 9 x 3 = 27
lebar = 5 x 3 = 15
luas = p x l = 27 x 15 = 405 m²
semoga membantu ^_^