Bunuel wrote:

In the figure, ABCD is a square, and all the dots are evenly spaced: each vertical or horizontal distance between two adjacent dots is 3 units. Find the area of the shaded region.

A. 60

B. 72

C. 81

D. 96

E. 120

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The dots are evenly spaced; distances between dots are equal.

As long as the shapes' side lengths are made with the same number of dots, they are congruent.

"Move" some of the shaded parts, see diagram, left square.

Right hand square: Now the shaded area is half the square's area.

One side of the square = 4 dots * 3 units = 12

Square area = 12\(^2\) = 144

Shaded area = half of square = 72

Answer B

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