The area of a rectangle is length x width.
Note that
1 in = 2.54 cm
1 cm = 1/2.54 = 0.3937 in
1 cm = 0.3937/12 = 0.032808 ft
w cm = w*0.032808 = 0.032808w ft
Therefore the area of the floor is
(21 ft)*(21 cm)
= (21 ft x 0.032808w ft)
= 0.689w ft²
Answer: 0.689w ft² (nearest hundredth)
