How do I cut this edge?

Im trying to cut this edge off on the sidewalk, how do I do this?

What I usually use here is a high edged (8-12) cylinder 2 times the size of the corner, and then cut that cylinder brush in half twice with the clipping tool.

[editline]13th August 2016[/editline]

http://i.imgur.com/DrEUN1g.png[/t]

[t]http://i.imgur.com/QW1aWhC.png[/t]
this x2 would be 256, so you draw out a 256 block and make this:

[t]http://i.imgur.com/uGPCJk5.png[/t]
which you clip in half to make

[t]http://i.imgur.com/453XNew.png[/t]
and again

[t]http://i.imgur.com/POfYFJx.png[/t]
and then you line it up and rotate the texture with the texture applicator tool. Higher sided cylinders equal less “blocky” edges. These were with a 8 sided cylinder and look a little jank, so here’s what a 12 sided cylinder looks like

[t]http://i.imgur.com/bXOIauG.png

Why wouldn’t you just use the clipping tool?

Thank you! Got it to work perfectly after 3 crashes! xD

[editline]14th August 2016[/editline]

Because its hard to get it perfect then.

I would actually use the Arch Tool because it would give a cleaner edge.