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lbr sbnrnya = 8 x 70 = 560 cm = 5,6 m
luas sbnrnya = p x l = 7,7 x 5,6 = 43,12
lebar sbnrnya = 8 cm x 70 = 560 cm
luas sbnrnya = p x l = 770 cm x 560 cm = 431200 cm^2