BONUS 2) You have a black square of side length 2s. A circle whose edges touch the edges of the square is cut out of the center of the square. A black diamond is placed into the circle so that the four corners
of the equilateral triangle lie on the edge of the circle. What percentage of the shape remains black?
a) 66.7%
b) 75.0%
c) 71.4%
d) 78.6%