The answer depends on the units used for 5 and 15. It should be obvious to you that the square footage of a 5 ft x 15 ft area will be somewhat different form that of 5 mile x 15 miles!
Multiply the two dimensions to get the area. In this case the calculations gives you 45 square feet.
5 feet by 10 feet is 50 square feet.
3.72 square meters.
The answer is 5 568 square ft.
Many possibilities exist: for example 32 ft x 10 ft.
15 square feet
138.75 square feet.
There are: 5*3 = 15 square feet
There are 3 times 5 = 15 square feet
75 square feet.
75
If 5' is 5 yards and 3' is 3yards then 15 square yards * 9 else if 5' is 5 feet and 3' is 3 feet then 15
(1/5) acre = 8,712 square feet.
75 square feet
141.25 square feet.
15 ft = 5 yards 5 yards* 5 yards = 25 square yards
45ft2