In searching the definition of a circle, then an ellipse, I felt like I stepped into stupido world where stupid is good. It's a wonder I made it through the formal schooling of this society. Those definitions are nonsensical. Search them yourself.
Then find out the difference between a perimeter and a circumference.
If you don't do this first, the rest of this and other messages will be less instructive because you have not warmed up to the task of seeking understandings.
PI In The Sky
Circles are all around you in the sky you live in.Yes you live in the sky, but your feet are on the ground.
Does your whole body have to be in the sky for you to be in the sky?
Does your whole body have to be in the water for you to be in the water?
Yet nobody claiming to have the feeling of walking on air, imagines themselves to be ten feet off the ground.
When you jump you are in the air, which is in the sky, yet you are in the same space as portions of your body when you don't jump.
How is it that buildings can be skyscrapers while firmly rooted on the ground, but not you?
Do birds fly in the air when they fly at your height, and then when they fly above you they fly in the sky?
Where does the sky start and the air ends?
No the sky is not the limit.
The air of logic you breathe to feed your spirit-soul is the limit.
This logic brought to you so you can be fit-to-be-tied to whatever lies the society provides.