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P=4/7.84:2=24
L=18
Luas=432 cm2
p=4l:3
Keliling= 2P + 2l
84= 2(4l:3) + 2l
84= 8l:3 + 2l
Sama-sama dikali 3
252= 8l + 6l
252= 14l
l= 252/14=18
P=4l:3
P=4.18/3
P=24
Luas= p x l= 24 x 18=432