Runes were NOT composed only of straight lines. That's a popular modern myth, generally spread by people who have apparently never bothered to look at the actual historical examples. Curved lines appear in pretty much every runic inscription ever made. Just do a search of the internet for "historical rune stones" and you'll see it for yourself — and it will disprove the nonsensical claim that carving a curved line in stone is any harder than a straight line, too.
Furthermore, runes continued to be used much later in history than most people realize, and there are runic texts written in ink on paper, and obviously the nonsense about carving wouldn't even apply there. Find a picture of the 14th century "Codex Runicus", which was written in Medieval Runes. There are curved lines all through it.
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It is easier to carve/score a straight line in stone compared to the effort required for a curved shape.
No, all polygons have straight lines. All lines are straight
Think about this: A straight angle makes 180 degrees, right? Straight lines, when measured by a compass, are also 180 degrees. So, yes, all straight angles are straight lines.
zero, all the keys have different letters, numbers, or symbols
All triangles - equilateral or not - have three straight sides.
A rectangle is a polygon shape since all lines are straight and connected.