320 square inches
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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.
There are 144 square inches in a square foot. This calculates out to be 5,040 square inches.
864 square inches.
32,400 square inches.
3 inches