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245 cm = 2.45 metres and 300 cm = 3 metres. 2.45 x 3 = 7.35 square metres.
1.6 square metres = 1.6 x 10000 square cm = 16000 square cm
If 23 of the area of the square is 54 then the area of the whole square is 54/23 = 2.3478 square metres. The sides are, therefore, 1.5323 metres and so the perimeter is 6.1290 metres.
8000 sq cm = 0.8 sq metres
It is 23 square metres.