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Since there are 4 large triangles in the square, total number of identical smaller triangles = 4 x 4 = 16

Fraction that is shaded = 1/16

Or

Shaded part is ¼ of the large triangle.

But large triangle is ¼ of the square.

¼ of large triangle = ¼ of ¼ of square

= ¼ x ¼ of square

= 1/16 of square

So fraction of the square that is shaded

= 1/16

Percentage = 1/16 x 100% = 6.25%

Or

100% → 16 units

1 unit → 100% ÷ 16 = 6.25%