The shaded parts
I see no shaded part fo the fraction must be "none".
The appropriate fraction of a given shape.
Count how many parts there are in total (both shaded and unshaded) and write this as the denominator (bottom number) of the fraction. Count how many shaded parts there are and write this as the numerator (top number) of the fraction. You now have the fraction of the whole that is shaded.
A shade circle ontop of a shaded square. ES
2/3 is not shaded.
1/2
You divide the area of the shaded region by the area of the full circle. For example, if the radius of the shaded region is 2 meters, the probability would be 4pi / 36pi, or 1/9. If the shaded region is a 'slice' of the circle, the chance is just the fraction of the circle which the 'slice' is.
It ultimately depends on the areas of the two shapes: Acircle = pi*r2 Asquare = l2 Fraction shaded = Acircle / Asquare = pi*r2/ l2 If the circle fills the square (e.g. l=2r) then the formula simplifies considerably: pi*r2/4r2 = pi/4
2/3 is not shaded; 2/3 is about 66.667%.
0. There is no circle so no shaded area of a circle!
The shaded parts
I see no shaded part fo the fraction must be "none".
One-sixth of the circle is not shaded, so the percentage of the circle that is not shaded is 16.67%.
Only half of the circle would be shaded.
The appropriate fraction of a given shape.
Count how many parts there are in total (both shaded and unshaded) and write this as the denominator (bottom number) of the fraction. Count how many shaded parts there are and write this as the numerator (top number) of the fraction. You now have the fraction of the whole that is shaded.