This is the fifth in a four-part series on the best places to look for a perfect circle.

First up: When does the perfect square start to get better?

Then, in the next part, how about the perfect triangle?

Finally, what about the Perfect Circle of the World?

The Perfect Circle, of course, is a circle that is exactly the same size as the circumference of the earth, and that is the circle with the radius R=2π.

The Perfect Square is a perfect triangle of size M=2, which is 2π+2π*2, or 2π*(R+M).

The Perfect Triangle is an ideal square of size R=4π, which has a diameter of 4π.

Now, to answer your questions about how to look in a circle, here are the best spots to look: