320 ft2
Simply multiply 16 times 20. Area is always Length times width (assuming you are talking about a rectangle).
There are: 16*20 = 320 square feet
16 x 16.5 square feet
15*16 = 240 square feet.
If the big square is 20 ft on each side the perimeter is 4*20 = 80 ft. The small square is one-fifth of the bigger square so each side will be 20/5 = 4 ft. The small square perimeter will be 4*4 = 16 ft. Combined perimeter = 80 +16 = 96 ft.
20 x 18 = 360
There are: 16*20 = 320 square feet
11 * 16 = 176 square feet
20 ft x 20 ft = 400 square ft
16 x 16.5 square feet
Perimeter of [ 16 x 26 ] rectangle = 16 + 16 + 26 + 26 = 84-ft . Perimeter of a 20-ft square = 4 x 20 = 80-ft . The rectangle has the greater perimeter.
15*16 = 240 square feet.
The answer depends on the units used for 16 and 20. It should be blindingly obvious to anybody that 16 ft x 20 ft and 16 cm x 20 cm, for example, will give very different answers.
If the big square is 20 ft on each side the perimeter is 4*20 = 80 ft. The small square is one-fifth of the bigger square so each side will be 20/5 = 4 ft. The small square perimeter will be 4*4 = 16 ft. Combined perimeter = 80 +16 = 96 ft.
20 x 18 = 360
16 ft * 24 ft = 384 ft2
14ft * 16 ft = 224 sq ft.
Answer: 16 m² = 172.222 ft²