450
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
450
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
15 ft * 15 ft = 225 sq ft = 20.903184 sq metres15 ft * 15 ft = 225 sq ft = 20.903184 sq metres
15ft *12ft = 180 sq ft = 16.72 sq metres.
22ft * 15ft = 330 sq ft = 30.658 sq metres
21 ft * 6 ft = 126 sq ft = 11.7 sq metres approx.
450 sq. ft.
21-ft x 3-ft = 63 ft2
length of the room times the width of the room. a 25'4" x15'6" room would be 392.666 sq foot, so just call it 394
240 square feet= 15 ft x 16 ft= 240 sq ft
multiply: 17 ft x 15 ft = 255 sq. ft.