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Polyline Area calculation bug


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I think this has been around for some time but I never needed accurate area calculations before so I didn't take notice. The calculation of polyline areas presented in the OIP is outside of standard acceptable tolerances. I only used the WideFlange because I was attempting to calculate weight when I noticed the error and that it was significant enough to alter the weight of a beam from which cost estimates are derived here in Canada.

Have I missed something???

 

image.png.205d0e66061399f24ecc5f0e0083fc6a.png

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Yes, I absolutely have made an error. I was using radius as Diameter.

 

20.02x20.02=400.8

10.01x10.01xπ=314.787

Δ 86.01

2914.82+2914.82+1655.25+86.01= 7570.90

against 7573.19 mm2

Δ 1.1 2.29 (I really need to use a calculator more often)

Not as bad as I had figured.

Edited by LarryO
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