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3-48.

For the entire rectangle at right, find the area of each part and then find the area of the whole.  

First, find the area of each individual box.

Generic rectangle

top edge left

top edge right

left edge top

interior top left

interior top right

left edge bottom

interior bottom left

interior bottom right

Add all of the areas together to get the entire area of the rectangle.

square units

Generic rectangle

top edge left

top edge right

left edge top

interior top left blank

interior top right blank

left edge bottom

interior bottom left blank

interior bottom right blank