Arc GIS seems inaccurate for drawing lines of specific length?

[BeckyRozumowicz]

Hello I have recently been tasked with creating a GIS map of our building layout.

This map needs to be detailed. I need to be able to draw a line that is exactly 10 feet long for example.

I browsed online and saw by creating a verticy and hitting Cntrl L you can tell Arc GIS '10 ft' .

However, if i calculate the geometry of the line this creates via attribute table it seems to always come out larger!

10 ft becomes 12.379 something feet. Why is the calculated geometry always larger? Is there a way to fix this?

[BeckyRozumowicz]

No, we don't have CAD software.

[BeckyRozumowicz]

I'll have to check this.

[BeckyRozumowicz]

Turns out it was the issue, the coordinate system being different.

[GregoryElwood1]

As a quick, additional note, I set the Map Units and Display Units in Data Frame Properties to Feet. I also use "Move To" (right-click when editing vertices) a lot. You can copy and paste X and Y values to different vertices and make accurate lines and polygons, which can often come in handy when you want to calculate area.