21 feet = 6.4008 metres
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21 ft * 10 ft = 210 sq ft = 19.51 sq metres.
21 ft * 6 ft = 126 sq ft = 11.7 sq metres approx.
To convert square feet to square meters, you need to multiply by 0.0929. The room is 21 ft x 14 ft = 294 square feet. To convert this to square meters, you would multiply 294 by 0.0929, which equals approximately 27.31 square meters.
21' equals 7 Yards. there are 3 Yards in a foot.
21ft by 10ft