Figure 12.16 shows the floor plan for a modern, one-story house. Bob calculates the area of the floor of the house this way: 36 x 72- 18 x 18= 2268 square feet. What must Bob have in mind? Explain why Bob's method is a legitimate way to calculate the floor area of the house, and explain clearly how one or both of the moving and additivity principles on area apply in this case.

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