Fitter’s circular division
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How to divide a circle with a diameter of 100 cm into 5 equal parts using a compass
It seems a ruler is also needed, but it’s quite troublesome
This post was last edited by wenmingdong on 2011-10-9 at 19:18. As shown in the figure, the steps are as follows: 1. Draw a line segment AB of any diameter. 2. Through point O, draw a radius OC perpendicular to AB. 3. Find the midpoint D of AO, and then connect CD. 4. On AB, mark a point E such that DE = CD; then connect CE. 5. With C as the center and CE as the radius, draw an arc that intersects circle O at point F; the arc CF corresponds to 1/5 of the circumference of the circle
On-site, if the requirement for equal division isn’t too strict, it can be simplified in this way: multiply the diameter by the corresponding coefficient to get the length, which can then be used for equal division. 3/0.866.3 4/0.70711 5/0.58779 6/0.5 7/0.43388 8/0.38268
On-site, if the requirement for equal division isn’t too strict, it can be simplified in this way: multiply the diameter by the corresponding coefficient to get the length, which can then be used for equal division. 3/0.866.3 4/0.70711 5/0.58779 6/0.5 7/0.43388 8/0.38268
On-site, if the requirement for equal division isn’t too strict, it can be simplified in this way: multiply the diameter by the corresponding coefficient to get the length, which can then be used for equal division. 3/0.866.3 4/0.70711 5/0.58779 6/0.5 7/0.43388 8/0.38268
Haha. . . . . Just ask a middle school student who is good at math, and they can help you sort it out. . . . Take a look at the mathematical methods specifically for drawing pentagrams; it seems that using a compass on-site isn’t very practical, is it? It can be determined on-site using the land regulations.
Haha. . . . . Just ask a middle school student who is good at math, and they can help you sort it out. . . . Take a look at the mathematical methods specifically for drawing pentagrams; it seems that using a compass on-site isn’t very practical, is it? It can be determined on-site using the land regulations.
I remember it as drawing a median line of the radius; the part that intersects the circle is the side length of the pentagon
Light is not pentagonal or hexagonal. If it’s 12, 13,. . . What will you do? It’s not that convenient on-site; what’s needed is efficiency. If descriptive geometry is used, it’s possible to accomplish it appropriately