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Area of Rectangle 1 = Height x Width
Area of Rectangle 1 = 13 x 7
Area of Rectangle 1 = 91
Area of Rectangle 2 = Height x Width
Area of Rectangle 2 = 15 x 7
Area of Rectangle 2 = 105
Area of Square = Side Length x Side Length
Area of Square = 15 x 15
Area of Square = 225
Total Area = Area of Rectangle 1 + Area of Rectangle 2 + Area of Square
Total Area = 91 + 105 + 225
Total Area = 421
Therefore, the total area of the polygon formed by Rectangle 1, Rectangle 2, and Square is 421 square units.