Area of the given polygon is required.
The area of the polygon is A. [tex]147\ \text{square units}[/tex]
The polygon is a rectangle with one corner of the rectangle removed.
The removed area is a square.
The area of the complete rectangle is
[tex]13\times 12=156\ \text{square units}[/tex]
Area of the removed square
[tex]3\times 3=9\ \text{square units}[/tex]
The area of the polygon is
[tex]156-9=147\ \text{square units}[/tex]
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