I just had a quick look at kGeo, it appears it may not be capable of doing what you want. Have a look at Qcad. It's actually a CAD drafting program but I think you can do lines entered from co-ordinate points with it.
Ok, so KGEO might not be familiar to all of you, but it is the free alternative to a $40 progeam called Geometer's Sketchpad. I am homeschooled and woking on Geometry. Soon to do constructions, this software would be VERY useful.
I ran into a problem, however. I cannot figure out how to draw a line segment from one existing point to another existing point. If i can't do this, it will cost me $40 to get software that can.
The knoppix help menu was no help on this problem. Does anyone here know how to do this?
BTW: when i click on the "make line segment" button, it makes me make 2 new points to draw the line in. I want to be able to use the "make point at (x,y)" button twice, then draw a line between the two made points. My Constructions are simply too precise to use the mouse for all of it...
I just had a quick look at kGeo, it appears it may not be capable of doing what you want. Have a look at Qcad. It's actually a CAD drafting program but I think you can do lines entered from co-ordinate points with it.
Dell PowerEdge R630 Server 2x E5-2680 V4 = 28 Cores S130 32GB RAM NEW 480GB SSD
$197.99
Dell Poweredge R630 Server 2x E5-2620 V4 =16 Cores | S130 | 32GB RAM | 2x trays
$159.99
Dell PowerEdge R630 Server 2x E5-2640v3 2.60Ghz 16-Core 64GB H330
$182.65
Dell PowerEdge R730 16-Bay 2.5” 2xE5-2695 v3 2.3Ghz 64GB iDRAC8 Ent H730 2x750W
$250.00
Dell PowerEdge R720xd 26HDD 300gb 2.5-inch E5-2697 X 2CPU 384RAM 7.2 Tb HDD 
$180.00
$90.00
Dell Poweredge R730xd 12 Bay LFF 2x SFF 2x E5-2680v3 2.5ghz H730p No Ram No HDD
$219.99
Dell R630 8 SFF Server 2x E5-2650 V4 2.2GHz = 24 Cores 64GB DDR4 SATA Only 1x PS
$243.20
DELL PowerEdge R430 8SFF 2x E5-2680v4 2.4GHz =28 Cores 32GB H730 4xRJ45
$226.00
DELL PowerEdge R630 8SFF Server 2x E5-2697v3 2.6GHz =28 Cores 128GB H730 4xRJ45
$352.00