Fill the World Map with City Dots Of Radius 40

Fun quiz as always, but I'm not sure these are really circles on this map! A circle projected onto a globe will take different shapes when drawn onto a map, depending on how far north or south you go. A circle will look like a circle at the equator, but as you move further north or south it will become a flatter and flatter ellipse (appearing to become wider and wider), until you reach a circle centred on either pole which will appear as a rectangle going from the left edge to the right edge of the map. Which brings me to my final question: Since they're not circles, what does "radius 40 " refer to?

Perth is much larger than Busselton, and Narvik is much larger than Longyearbyen, and the circle covering "McMurdo Station" also covers the southern third of the South Island, whose largest city is Dunedin, pop 118,500. Am I getting the instructions wrong here? I thought you have to choose the largest city that is inside each circle.

One other thing: when you click on the map to enlarge a specific region, the circle covers a different area. You might need to disable the zoom function to avoid confusion?

citypopulation.de measures greater urban areas, so working by that principle, Papeete (pop 127,000) is much bigger than Faa'a, which is one of Papeete's suburbs. Papeete city is divided into several communes, one of which is also called Papeete (the downtown commune?) with 26,000, slightly smaller than Faa'a with 30,000.