First find the area of the circle using A=pi*r^2 pi*36 Then divide this by 4 because the shaded region is 1/4 of the circle (36*pi)/4=9*pi Final answer: B
The triangle will be rotated with the rule of (x,y) → (-y,x). The image will be congruent to the pre-image, the side lengths will be the same and the angles too.
