Circle Challenge: Four Intersecting Circles

Start with a square of side 3, and four circles.
[br]Each circle is centered at one of the corners of the square, with radius equal to the side of the square.[br][br]Notice the area inside the circle where the four circles overlap. [br][br][br]QUESTION: How can you "describe" that area algebraically? [br][br]More specifically, how can you ask GeoGebra to highlight it like it was done below?[br][br]
Hints
-- Think about the equation of a circle. What does it describe? [br][br]-- We have four circles, so we have an equation for each one of them.[br][br]-- We have to start from the equation, but we'll use inequalities (four of them!) to highlight the area.
Type your answer here.
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