AutoCAD LT General Discussion

AutoCAD LT General Discussion

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*Expert Elite*
drjohn
Posts: 1,717
Registered: ‎03-01-2006
Message 1 of 4 (333 Views)
Accepted Solution

Riddle me this, Batman ....

333 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*
nestly2
Posts: 1,375
Registered: ‎04-22-2013
Message 2 of 4 (325 Views)

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
KateMorrical
Posts: 247
Registered: ‎11-07-2012
Message 3 of 4 (319 Views)

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*
drjohn
Posts: 1,717
Registered: ‎03-01-2006
Message 4 of 4 (312 Views)

Re: Riddle me this, Batman ....

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

D'oH !!!


Brain f*rt.  :smileyembarrassed:

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