because when the earth settles they cement could crack and the sections help prevent cracking into other blocks
There are two morphemes in the word "sidewalks": "side" and "walks".
Infinitely many.
An infinite number of lines can pass through a point.
An infinite number of lines can pass through any given point.
An infinite number
Through two given lines, there can be either zero, one, or infinitely many lines that can be drawn, depending on their relationship. If the two lines are parallel, no line can pass through both. If they intersect, exactly one line can be drawn through their intersection point. If they are coincident (the same line), then infinitely many lines can be drawn through them.
yes.Cement sidewalks can provide a nice looking addition to a home and they aren't just attractive, they also add value to a property. Unfortunately, a characteristic of cement that many people aren't aware of, is it's porous and it will absorb water. Over the seasons, water can get into the surface of a cement sidewalk and with the melting and freezing cycles the moisture can actually cause cracks in the cement. Luckily fixing cracks in a cement sidewalk isn’t a difficult job (it's well within the skill set of most homeowners) and the tools and supplies are readily available at your local home store.
An infinite number of lines.
there are 6 lines can pass through 4 noncollinear points.
5 or 6 lines of longitude
I assume you mean that the line goes through a certain point. There is no limit to how many lines you can have through the same point.
Infinitely many.