CAD Forum discussion (EN) : Mathematical error in CAD? https://www.cadforum.cz/forum_en/ Mon, 11 May 2026 20:51:42 +0000 Thu, 18 Oct 2018 19:09:38 +0000 http://blogs.law.harvard.edu/tech/rss Web Wiz Forums 12.04 360 https://www.cadforum.cz/forum_en/RSS_post_feed.asp?TID=12707 <![CDATA[CAD Forum discussion (EN)]]> https://www.cadforum.cz/forum_en/forum_images/web_wiz_forums.png https://www.cadforum.cz/forum_en/ <![CDATA[Mathematical error in CAD? : mypushpi wrote: The values...]]> https://www.cadforum.cz/forum_en/forum_posts.asp?TID=12707&PID=36474&title=mathematical-error-in-cad#36474 Author: Kent Cooper
Subject: 12707
Posted: 18.Oct.2018 at 19:09

Originally posted by mypushpi mypushpi wrote:

The values of lengths and angles which displaying in drawing are not right accurate. there are some digits remaining, but not displaying in our parameter. so it is very close to, but not equal to value. Answers depend on accuracy.
 
It knows accurately -- you probably just have it set to display rounded off to a lower precision [fewer decimal places, or lower-denominator fractions] than you want.  Look into the LUPREC and AUPREC System Variables, and in Dimension Styles, the Primery Units' Precision settings for both Linear and Angular Dimensions.
]]> Thu, 18 Oct 2018 19:09:38 +0000 https://www.cadforum.cz/forum_en/forum_posts.asp?TID=12707&PID=36474&title=mathematical-error-in-cad#36474 <![CDATA[Mathematical error in CAD? : The values oflengths and angles...]]> https://www.cadforum.cz/forum_en/forum_posts.asp?TID=12707&PID=36470&title=mathematical-error-in-cad#36470 Author: mypushpi
Subject: 12707
Posted: 18.Oct.2018 at 11:01

The values of lengths and angles which displaying in drawing are not right accurate. there are some digits remaining, but not displaying in our parameter. so it is very close to, but not equal to value. Answers depend on accuracy.]]> Thu, 18 Oct 2018 11:01:18 +0000 https://www.cadforum.cz/forum_en/forum_posts.asp?TID=12707&PID=36470&title=mathematical-error-in-cad#36470 <![CDATA[Mathematical error in CAD? : Kent Cooper wrote:.... the...]]> https://www.cadforum.cz/forum_en/forum_posts.asp?TID=12707&PID=35953&title=mathematical-error-in-cad#35953 Author: Kent Cooper
Subject: 12707
Posted: 19.Apr.2018 at 18:36

Originally posted by Kent Cooper Kent Cooper wrote:

.... the degrees-minutes-seconds parts of the metes and bounds for two lines would have to have either their sum or their difference equal to 90 degrees for them to be perpendicular.  ....
 
[I just realized I was wrong about that -- it's only the sum.  Surveyor's Units D-M-S values never reach or exceed 90 degrees.]
]]> Thu, 19 Apr 2018 18:36:12 +0000 https://www.cadforum.cz/forum_en/forum_posts.asp?TID=12707&PID=35953&title=mathematical-error-in-cad#35953 <![CDATA[Mathematical error in CAD? : You can see it without having...]]> https://www.cadforum.cz/forum_en/forum_posts.asp?TID=12707&PID=35950&title=mathematical-error-in-cad#35950 Author: Kent Cooper
Subject: 12707
Posted: 18.Apr.2018 at 20:42

You can see it without having to draw an angular Dimension.  In that kind of situation, depending on the specific directions, the degrees-minutes-seconds parts of the metes and bounds for two lines would have to have either their sum or their difference equal to 90 degrees for them to be perpendicular.  Just looking at the sum of the degrees and minutes parts for that triangle's legs, you get only to 89 degrees 40 minutes.  The seconds adds about another arc-minute, but the total is clearly not going to be 90 degrees.]]> Wed, 18 Apr 2018 20:42:59 +0000 https://www.cadforum.cz/forum_en/forum_posts.asp?TID=12707&PID=35950&title=mathematical-error-in-cad#35950 <![CDATA[Mathematical error in CAD? : Good catch, Kent Cooper! I changed...]]> https://www.cadforum.cz/forum_en/forum_posts.asp?TID=12707&PID=35948&title=mathematical-error-in-cad#35948 Author: KingsDaughter
Subject: 12707
Posted: 18.Apr.2018 at 19:48

Good catch, Kent Cooper! I changed the decimal setting and discovered the angle is 90.314. Thank you! Sometimes you just need more eyes on the problem to see it.
Smile
]]> Wed, 18 Apr 2018 19:48:23 +0000 https://www.cadforum.cz/forum_en/forum_posts.asp?TID=12707&PID=35948&title=mathematical-error-in-cad#35948 <![CDATA[Mathematical error in CAD? : That would be about right if it...]]> https://www.cadforum.cz/forum_en/forum_posts.asp?TID=12707&PID=35947&title=mathematical-error-in-cad#35947 Author: Kent Cooper
Subject: 12707
Posted: 18.Apr.2018 at 19:36

That would be about right if it were a right triangle, but the other two edges are not perpendicular to each other.]]> Wed, 18 Apr 2018 19:36:48 +0000 https://www.cadforum.cz/forum_en/forum_posts.asp?TID=12707&PID=35947&title=mathematical-error-in-cad#35947 <![CDATA[Mathematical error in CAD? : I have a triangle shaped area...]]> https://www.cadforum.cz/forum_en/forum_posts.asp?TID=12707&PID=35946&title=mathematical-error-in-cad#35946 Author: KingsDaughter
Subject: 12707
Posted: 18.Apr.2018 at 19:03

I have a triangle shaped area of property. In labeling the lines, CAD gives an incorrect answer for the hypotenuse of the triangle. It should be 73.85 and CAD shows it as 73.997. What's up with that and is there a setting I need to change to get the correct length?


]]> Wed, 18 Apr 2018 19:03:06 +0000 https://www.cadforum.cz/forum_en/forum_posts.asp?TID=12707&PID=35946&title=mathematical-error-in-cad#35946