Europe Circle Radius Population Split Challenge

The object of this quiz is to adjust each circle's diameter so it splits the circle's European population as evenly as possible. When you click Start you will be shown a marker on a random world location. Also you will see an circle between 100 and 1000 km radius. Adjust the diameter by rotating it using the endpoints, trying to split the halves into equal populations. Then click submit. You are scored on how close you have split the circle into 50% population in each half.

PLEASE NOTE: ALL of Turkey is included in counting population (not just European portion), and the portion of Russia west of 61.5 degrees E (just east of Chelyabinsk). Nothing outside Europe (such as Africa or middle east other than Turkey) is included toward the population count within a circle.