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This formula is not correct

(a+b)^2 = a^2 +b^2+ 2ab &

(a +b+ c)^2 =a^2 + b^2 + c^2 +2(ab+bc+ca)

(a+b)^2 = a^2 +b^2+ 2ab &

(a +b+ c)^2 =a^2 + b^2 + c^2 +2(ab+bc+ca)

Suppose there is a square of area a