Question

attached question, answerer(s) get medals!

Answer 1

About 20%

Answer 2

Shaded is Pi/4 %, so unshaded is about 20%.

Answer 3

If you want to know how to go about solving this problem:
it basically is wanting to know the ratio of areas between the white and shaded.
You can tell that both are within a square, and the shaded is actually made of 2 half circles.

let's say that the radius of the circle is r.
Area of circle is: 3.14*r^2,
The area of the square would be the length of one side squared. The length of that side is actually 2r, so the
area of the entire square is: (2r)*(2r) = 4r^2

so the ratio of the shaded to the total area is
\[(r^2*\pi)/(4*r^2)\] = \[\pi/4\]

what we want is the ratio (in percent) of white to total, not shaded to total,
and since it is either white or shaded (white + shaded = total)
then this ratio would be
1- 3.14/4 which is about 21%

Answer 4

oh, wow. I thought the whole thing was just random guessing. thanks a lot!