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Grade five math homework: there is a square, the company commander is 1 1CM, and e and f are the midpoint of AB and BC respectively. What is the area of the shaded part?
There is a square with a side length of 1 1 cm, and e and f are the midpoint of AB and BC respectively.

Ae = ab = BF = fc =11/2 = 5.5, and the height is the side length.

Draw four triangles diagonally with a dotted line.

Triangle area = one-half base times height.

Shaded part = bottom times height =5.5 times11= 60.5cm2.