There are 23 square green blocks in the figure, and the note up in the corner shows us that each square has (1 inch x 1 inch) = 1 square inch of area.
You ought to be able to handle it from here.
To find the area of a figure made of square blocks, count the number of squares and multiply by the area of each. For 23 squares, the area is 23 square inches. Thus, the total area of the figure is 23 square inches.
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