Answers vary. All the possibilities for the number of rows and columns are listed below. Some of them may not fit into the grid provided.
1 row, 28 columns OR 2 rows, 14 columns OR 4 rows, 7 columns OR 7 rows, 4 columns OR 14 rows, 2 columns OR 28 rows, 1 column
The area is 35 square units.
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