17 feet = 5.1816 meters
12 ft 9 inches = 3.8862 meters
5.1816 * 3.8862 = 20.1367 meters squared.
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Around 50 square metres, as a rough guess!
50 square metres
21 ft * 10 ft = 210 sq ft = 19.51 sq metres.
6600 mm * 8100 mm = 6.6 m * 8.1 m = 53.48 sq metres. A very large room!
250 square foot