Find the difference of the shaded areas from two overlapping squares I have a question from a school problem-solving homework sheet. 
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Question: Two squares, A and B of the side lengths 6 cm and 5 cm respectively, overlap each other partially. Find the difference of the two shaded areas.

Here is the diagram

The difference of the two shaded areas is just the area difference of the two squares, i.e. $36 - 25 = 11\space \text{cm}^2$. The overlapping area simply cancels out in the difference.
An obvious case is where the smaller square is right inside the larger one.
