3 feet in a yard, so you have 7 yards by 5 yards..... = 35 yd2
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21 ft * 10 ft = 210 sq ft = 19.51 sq metres.
15ft x 20ft= 5yards x 20/3yards 100/3 sq yards =33.3333333333 sq yards
21 ft * 6 ft = 126 sq ft = 11.7 sq metres approx.
21-ft x 3-ft = 63 ft2