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!
15 square meters is 161.46 square feet.
15 kilometers is approximately equal to 9.3 miles.
15 km is equal to approximately 9.32 miles.
225 square feet (15 x 15 = 225).
15 square miles = 9,600 acres.
15 square miles = 9,600 acres.
150 acres is 15/64ths of a square mile.
1 sq mile = 640 acres 15 sq miles = 15 x 640 miles =9600 acres
10542 square feet is equal to 0.242011 acres.
15 acres = 653,400ft²
72,600 square yards = 15 acres.
15 acres = 60,702.85 square meters
15 acres is 653,400 square feet
0.15 acres = 6,534 square feet
Louisiana is the 31st largest US state with 51,839.7 total square miles.
15 acres = 60702.85 sq metres (to 2 dp)