3420.28 – Shaded Square Area


The figure consists of squares and isosceles triangles. What percent of the entire figure is unshaded?

3420_28_2a6e071cf2.png


Solution

Consult the figure below. After some clever rearranging, we see 5 shaded squares and 3 unshaded ones. So apparently 3/8 = 37.5 percent of the figure is shaded.

3420_28_solution_1a59687ce4.png