You are probably thinking of the Moebius strip.
Sphere, torus, moebius strip
Believe it or not, it's a rectangle. If you strip it away and lay it down flat, it turns into a rectangle.
history of transition graph
Yes, technically a curved line can be a line segment, a line in general is something that can be curved or straight
actually what happen is that the strip is curved to the outside
spline
The strip is called a "transition or molding". You will need one called a "T-moulding", which from the end looks like a T. This will allow a smooth transition between the 2 floors.
You are probably thinking of the Moebius strip.
Sphere, torus, moebius strip
Believe it or not, it's a rectangle. If you strip it away and lay it down flat, it turns into a rectangle.
The Sahel is a grassland transition zone below the Sahara.
The savanna is a biome that is a transition zone between a desert and a forest or grassland.
the sahel is indeed a strip of dry grassland that lies directly south of the Sahara desert but they don't share any actual border line so much as a gradual transition zone
Irene Sturm Lefebvre has written: 'Cherokee Strip in transition' -- subject(s): Frontier and pioneer life, History
I don't think folding is the right way to approach this transition. My carpet has a tack strip installed next to the tile and the carpet is cut so it lays right next to the tile edge. The tack strip holds it secure. There are also different joint transition trim pieces you can use if the height variation is to great. Check out Home Depot or Lowes.
Many people who do drafting ( by hand, not CAD) use what is called a flexible curve. This is often a lead core rubber or plastic coated flexible device that helps draw curved lines. They come in different sizes.