390 centimeters = 3.9 meters and 490 centimeters = 4.9 meters Therefore: 3.9 meters x 4.9 meters = 19.11 square meters.
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4.9 metres is equal to 490cm
490cm to the nearest metre is 5 metres
(3 x 3) sqm
4 x sqrt 430 = 4 x 20.736 = 82.944 m
144 sqm just multiply both