Faces A and C are squares.
2 answers:
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Area of a square with side s is 
In your question, the side or s is:
And so the area of a square with that side length would be:
And using this formula:
We get that the area is:
And simplifying that we get the final answer as:
In your question, the side or s is:
And so the area of a square with that side length would be:
And using this formula:
We get that the area is:
And simplifying that we get the final answer as: