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This problem trains for: SAT-I.

Three squares of sides x, a, b such that:

equation

are placed as in the figure:

figure

Which of the following formulas expresses the shaded area?

figure

The surface shaded in red has area:

equation

In the largest square, the non-overlapping surface has area:

equation

In the square of side b, the non-overlapping surface has area:

equation

Finally, the shaded area is:

equation

equation

equation