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.
320 square inches
There are 144 square inches in a square foot. This calculates out to be 5,040 square inches.
6 inches on each side. To get square inches of a square you multiply length by width. So, 6 inches by 6 inches = 36 square inches.
16/12=1.3333333 20/12=1.6666666 1.3333333X1.666666=2.2222222 or 16X20/144=2.22222222
There are 144 square inches in one square foot, so there are 17,280 square inches in 120 square feet.
320 square inches
2
A 16x20 poster is 16 inches wide and 20 inches tall.
The standard size of a 16x20 photo is 16 inches by 20 inches.
16x20
3,444.45133 square feet.
Standard frame sizes for displaying photographs and artwork in inches include 4x6, 5x7, 8x10, 11x14, and 16x20.
The optimal resolution for a 16x20 image is 2400x3000 pixels.
The recommended resolution for a 16x20 print is 2400x3000 pixels.
The dimensions of a 16x20 image in pixels are 1920x2400 pixels.
The ideal aspect ratio for a 16x20 print is 4:5.
The optimal resolution in pixels for a 16x20 print is 4800x6000 pixels.