The length of a 2D array is the number of rows it has. You might guess that "length" could be defined as a number pair (rows, columns). But the number of columns may vary from row to row so this will not work.
eg.
int arr[][] = new int[2][4];
so arr.length = 2, and arr[0].length=4 i.e. length of row.
(Note we are using length and not length() )
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