The radius of the circle is 11

The radius of each arc's circle is 16.

Solve for the area of sector's 1,2,3 and 4

I did some math and found the area's of section 4 and 3 I THINK they are:

Area of 4 =

Area of 3 =

but i seem to be having a hard time finishing the problem, and finding excally were the 3rd arch intersects the circle.. Any help would be nice - and i would like to make sure my current numbers are correct as well.