Respuesta :
Answer: 189 ft^2
Step-by-step explanation:
Area=21 ft x 9 ft
=189ft2
The area of the floor is 21 square yards or 189 square feet.
What is an area of a rectangle?
The area of a rectangle is = length * breath
calculation:-
1 yard = 3 feet.
A rectangular floor is 7 yards long = 21 feet
A rectangular floor is 3 yards wide = 9 feet
area of a rectangle = length * wide
⇒ 21 feet*9 feet.
⇒ 189 square feet
Learn more about the area here:-https://brainly.com/question/25292087
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