To find each incline you would need to find the other leg of the triangle using the measurements given. The middle rectangle section would be 1000km because you would subtract the measurements on the triangles.
The area of a circle is a=×π. Now just plug in the values you have which is you area. 201=×π now divide by pi on both sides you that you get about 64=. Now find the square root on both sides which will then give you 8 as your radius. To find diameter from radius you have to multiply by 2. 8*2=16