If the room is rectangular, just use the formula for the area of a rectangle. In other words, multiply length x width.
11 ft * 13 ft = 143 sq. ft, so the room has an area of 143 sq. ft
(13-ft x 16-ft) / (9 square feet per square yard) = (23 and 1/9) square yards
156 feet. 12 ft. X 13 ft.
That room size can be estimated 15 ft x 40 ft
13 ft x 42 ft = 546 sq ft
And 23 ft x 23 ft room is 529 sq ft.
11 ft * 13 ft = 143 sq. ft, so the room has an area of 143 sq. ft
(13-ft x 16-ft) / (9 square feet per square yard) = (23 and 1/9) square yards
156 feet. 12 ft. X 13 ft.
That room size can be estimated 15 ft x 40 ft
235
13 ft x 42 ft = 546 sq ft
19 feet (12 in/1 ft)(2.54 cm/1 in)(1 meter/100 cm)= 5.7912 meters=========================( you can call this 23 m2 )
221 square feet
If your room is rectangular, two sides will be 20 feet long and the other two will be 13. So the total length around the room is 66 ft.
10.5 ft * 13 ft = 136.5 square feet
Height of shoulder, 8 ft. to 13 ft.