4 feet by 10 feet is 40 square feet.
4' * 4' = 16 sq feet.
4' X 6= 24 square feet.
56 square feet.
16 square feet. This is an easy calculation - just multiply the length in feet by the width in feet. The answer is the number of square feet.
215.3 square feet for this room.
It is 4 times 15 = 60 square feet
21 x 4 = 84 square feet.
3 feet equals 1 yard and so 4 times 5 = 20 square yards
If you mean a circle of diameter 135 feet, the area is Pi x 1352/4 = 14315.7 sq ft
4 feet by 10 feet is 40 square feet.
4' * 4' = 16 sq feet.
4 x 9 = 36 (square feet).
36 x 4 = 144 square feet.
21 x 4 = 84 square feet.
4*9 = 36 square feet.4*9 = 36 square feet.4*9 = 36 square feet.4*9 = 36 square feet.
If the given dimensions are in feet then 4 times 4 equals 16 square feet