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[" 20.If "G" is centroid and "A,B,C" are vertices then "],[" 1) "3GA^(2)=AB^(2)+BC^(2)+AC^(2)],[" 2) "GA^(2)+GB^(2)+GC^(2)=(1)/(3)(AB^(2)+BC^(2)+CA^(2))],[" 3) "AB^(2)+BC^(2)+AC^(2)=3(GA^(2)+GB^(2)+GC^(2))],[" 4) "3AB^(2)=GA^(2)+GB^(2)-GC^(2)]

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