Draw Ogee four centered arch with six parts

There are many types of Ogee arches, including the three-centered arch and the four-centered arch. Each of these arch types has its own variations.
Today's lesson is about drawing an Ogee four-centered arch using six parts.
For those who require further instruction on drawing arches, I've provided some helpful links below:
1-Draw Ogee three centered arch sample 1using autocad
• Draw Ogee three center...
2-Draw Tudor arch sample (1) using autocad
• Draw Tudor arch sample...
3-Draw Ogee Gothic four centered arch sample 1
• Draw Ogee Gothic four ...
4-Draw rampant arch using autocad
• Draw rampant arch usin...
5-Draw equlateral arch
• Draw equlateral arch
6-Draw lancet arch
• Draw lancet arch
7-Draw Keel Arch by autocad
• Draw Keel Arch by autocad
8-draw cinquefoil arch by autocad
• Draw cinquefoil arch b...
9-draw hyperbolic arch sample 2
• Draw hyperbolic arch s...
10-draw parabolic arch
• Draw parabolic arch
11-Draw tudor arch sample 3 by autocad
• Draw tudor arch sample...
12-Draw Tudor arch sample (2) by using autocad
• Draw Tudor arch sample...
13-draw pointed trefoil arc
• Draw pointed trefoil arch
14-draw jack arch or flat arch sample 1
• Draw jack arch or flat...

[@DefinitelyAPotato]

It would be great if there was more explanation to WHY you were doing things the way you are. Why divide the base in to 6 parts? How would they have drawn this arch in medieval times with just a compass and a straightedge?

[@EengineeringdrawingCad2]

Hi, there are many different types of arches, and for each type, there is a specific way to draw them. In medieval times, they discovered that dividing the base into six parts creates a beautiful shape.
In medieval times, various types of instruments, such as compasses, straightedges, and dividers, were used to divide lines into equal parts. These three tools were sufficient for drawing various types of arches.
see this video also may help you
czcams.com/video/k6t9AOGWG-s/video.html

[@DefinitelyAPotato]

​@@EengineeringdrawingCad2but why 6? What's the reasoning behind that? The video you linked really doesn't cover arches like these.

[@EengineeringdrawingCad2]

As I'll tell you, in medieval times, they discovered that dividing the base into six parts creates a beautiful shape. It is possible to divide it into more or fewer than six parts, but it will result in a different shape. You can see the link below for another type of arch divided into eight parts
czcams.com/video/jxGNysZiIXw/video.html