How is the trace of a square matrix found?

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vector parallelogram for addition and subtraction — linear algebra One method of adding and subtracting vectors is to place their tails together and then supply two more sides to form a parallelogram. The vector from their tails to the opposite corner of the parallelogram is equal to the sum of the original vectors. The vector between their heads (starting from the vector being subtracted) is equal to their difference.

In linear algebra, the trace of a square matrix is found by calculating the sum of the elements located on its main diagonal, which runs from the upper left to the lower right of the matrix.1

If $A$ is a square matrix of order $n$ , its trace is the sum of the diagonal elements $a_{i i}$ for $i = 1, 2, \dots, n$ .1