A unit square is subdivided into a grid composed of 9 squares each with sidelength 1/3 . A circle
is drawn through the centers of the 4 squares in the outermost corners of the grid. Compute the
area of this circle. Pick one
A) 1π/9
B) 3π/9
C) 5π/9
D) 7π/9
E) 2π/9
The circle's radius lies between the centers of two diagonally adjacent small squares.   Therefore it is equal to the diagonal of one small square, and r =√2/3.The circle's area is thus   2π/9 .   correct answer 2π/9
<result>E</result>
A unit square is subdivided into a grid composed of 9 squares each with sidelength 1/3 . A circle
is drawn through the centers of the 4 squares in the outermost corners of the grid. Compute the
area of this circle.