AutoCAD LT General Discussion

AutoCAD LT General Discussion

Reply
*Expert Elite*
1,782 Posts
85 Kudos
Registered: ‎03-01-2006
Post 1 of 4
Accepted Solution

Riddle me this, Batman ....

382 Views, 3 Replies
09-16-2013 01:00 PM

Make a polyline (rectangle) that is  32 1/4 by 75 1/4 and radius all corners with a 4" radius.

 

Now, highlight the line and check properties and what does it read?

 

Spoiler
I get 208 1/8 reported from the PROPerties panel but doing the math of the linework it returns 208 1/4 with 4* 6 5/16 + 2 * 67 1/4 + 24 1/4 *2 = 208 1/4

 

Maybe I'm doing something wrong or not adding correctly but it doesn't match.

 

TIA

 

Regards,

DJ

 

Rounding.... specifically the arc segments  (you also rounded them to the nearest 1/16th)

 

Precision.jpg

Rounding errors got you. The perimeter of your quarter arc isn't 6-5/16 (6.3125), it's 6.28318. Multiply the difference (0.02932) by 4 and you've got your 1/8" (0.11728) discrepancy.

*Expert Elite*
2,166 Posts
436 Kudos
Registered: ‎04-22-2013
Post 2 of 4

Re: Riddle me this, Batman ....

09-16-2013 01:23 PM in reply to: drjohn

Rounding.... specifically the arc segments  (you also rounded them to the nearest 1/16th)

 

Precision.jpg

Mentor
249 Posts
59 Kudos
Registered: ‎11-07-2012
Post 3 of 4

Re: Riddle me this, Batman ....

09-16-2013 01:29 PM in reply to: drjohn

Rounding errors got you. The perimeter of your quarter arc isn't 6-5/16 (6.3125), it's 6.28318. Multiply the difference (0.02932) by 4 and you've got your 1/8" (0.11728) discrepancy.

--
Kate Morrical
Digital Design Manager
Washington, DC
BIMmuse.com
*Expert Elite*
1,782 Posts
85 Kudos
Registered: ‎03-01-2006
Post 4 of 4

Re: Riddle me this, Batman ....

09-16-2013 01:34 PM in reply to: KateMorrical

D'oH !!!


Brain f*rt.  :smileyembarrassed:

Post to the Community

Have questions about Autodesk products? Ask the community.

New Post
Announcements
Are you interested in helping shape the future of the Autodesk Community? To participate in this brief usability study, please click here. Your time and input is greatly appreciated!