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84 = 2 (2x+x)
84=6x
x=14
panjang=2x=28
luasnya=p xl = 28 x 14 = 392 cm2
(P-2L=0) + (2P + 2L=84) = 3P = 84,P=28 cm,L=84-28x2=28
b. luas= 28X28= 784 cm^2