How many square feet are 20x20 inches

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How many square centimeters is 1 square inch?
Surface is defined as LäA X LäB, or the square of the Lä. The metric surface sizes (square centimeters, square meters, hectares, ha, etc.) are derived from the metric measure of the length METER.
1 square inch = 6.45 Square centimeters
2 square inch = 12.90 Square centimeters
3 square inch = 19.35 Square centimeters
4 square inch = 25.81 Square centimeters
5 square inch = 32.26 Square centimeters
6 square inch = 38.71 Square centimeters
7 square inch = 45.16 Square centimeters
8 square inch = 51.61 Square centimeters
9 square inch = 58.06 Square centimeters
10 square inch = 64.52 Square centimeters
11 square inch = 70.97 Square centimeters
12 square inch = 77.42 Square centimeters
13 square inch = 83.87 Square centimeters
14 square inch = 90.32 Square centimeters
15 square inch = 96.77 Square centimeters
16 square inch = 103.23 Square centimeters
17 square inch = 109.68 Square centimeters
18 square inch = 116.13 Square centimeters
19 square inch = 122.58 Square centimeters
20 square inch = 129.03 Square centimeters
21 square inch = 135.48 Square centimeters
22 square inch = 141.94 Square centimeters
23 square inch = 148.39 Square centimeters
24 square inch = 154.84 Square centimeters
25 square inch = 161.29 Square centimeters
26 square inch = 167.74 Square centimeters
27 square inch = 174.19 Square centimeters
28 square inch = 180.64 Square centimeters
29 square inch = 187.10 Square centimeters
30 square inch = 193.55 Square centimeters
31 square inch = 200.00 Square centimeters
32 square inch = 206.45 Square centimeters
33 square inch = 212.90 Square centimeters
34 square inch = 219.35 Square centimeters
35 square inch = 225.81 Square centimeters
36 square inch = 232.26 Square centimeters
37 square inch = 238.71 Square centimeters
38 square inch = 245.16 Square centimeters
39 square inch = 251.61 Square centimeters
40 square inch = 258.06 Square centimeters
41 square inch = 264.52 Square centimeters
42 square inch = 270.97 Square centimeters
43 square inch = 277.42 Square centimeters
44 square inch = 283.87 Square centimeters
45 square inch = 290.32 Square centimeters
46 square inch = 296.77 Square centimeters
47 square inch = 303.23 Square centimeters
48 square inch = 309.68 Square centimeters
49 square inch = 316.13 Square centimeters
50 square inch = 322.58 Square centimeters