need to find area of shaded area of road http://img98.imageshack.us/img98/9315/roadw.jpg

i worked out that the shaded area with the radius of 6 is about 7.7m for each side so that is 15.4

and the middle part is 21-50.25 =29.25 =29.25 * 8 = 234 gives the middle section

then i found the top circle by pie r squared 3.14*12^2 = 452.38

i think that is right so far just need some help finding area where the radius is 9