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Elementary school math problem: how to find the face of a small square in a square
As shown in the figure: the big square is divided into 16 small triangles with the same size.

The shaded part occupies four small triangles.

24×24÷ 16

=576÷ 16

=36 square centimeters? The area of a small triangle

The area of a small square of 36×4 = 144 cm2.