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Find the area of the hidden part of mathematics in the fifth grade of primary school.
First, calculate the area of the square. The area of square ABCD is 3*3=9, and that of square BEFG is 2*2=4.

The area of two squares is 4+9= 13.

Then calculate the area of the triangle, △ ADC =1/2 * 3 * 3 = 9/2 △ AFE =1/2 * (3+2) * 2 = 5.

So the shadow area is 13-5-9/2=7/2.

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