9 by 9
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A rectangle minus a smaller rectangle which share a vertex.
The area of rectangle is : 21.0
It depends on whether the side length of 3 is the smaller or the larger of the two sides of the second rectangle. that is, is the 3 related to the 8 or the 17.
What is the length of the rectangle? If you had said one of the sides of a square was 3 inches, you could multiply 3 inches by 3 inches to get the value in square inches.Area = 3l square inches, where l = length of the rectangle in inches.
area of any rectangle is length x breadth. For a 6x3 rectangle, it's 18.