28^2 (28 x 28) is equal to 784.
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28 cm squared
1,2,4,7,14,28 28=2 squared times 7
5.2915026
7^2 - 3*7 49 - 21 28
he made the theorem C squared = A squared + B squared and A squared = C squared - B squared or B squared = C squared - A squared