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You are looking for the circumference. which is C(circumference)= 
x r (radius)
the radius is =to half of the diameter.
c=56.55
the radius is =to half of the diameter.
c=56.55
Given:
The area model.
The area of the shape is 82 square units.
To find:
The correct equation for the given situation.
Solution:
We know that, area of a rectangle is
The figure is divided into 3 rectangles. Using this formula, the area of each rectangle is
Now, the total area is equation to 82 square units.
Since the required equation is , therefore, the correct option is C.