Rectangular marquee tool in PS 6

I start by making a square (with the marquee tool) with th size of 200x200. Now I want to split it from top right corner to bottom left corner (a 46 degree cut) to get 2 triangles. Is there an easier way of doing this than pixel by pixel?

Thank you in advance!

Try this as an alternative:

Choose the polygonal lasso tool and select a triangle. Once you're done with that portion, hit shift, ctrl, i to invert the selection to the other portion.

Hope this helps?

Ash

or you could just do the polygonal vector shape tool for a 3 sided shape ... do it propotional and then convert it to a selection.

You can use the polygon tool, that would work, or you could do it this way:

Select the whole thing - and convert that selection to a shape or path. Now you have a perfect outline rectangle that is a path. Take the pen tool that has the minus ( - ) sign right next to it, and click it over one of the dots on one of the corners of your rectangle. You now have a perfect split triangle made from your perfect rectangle dimensions. Takes you three commands, and you are done.

And, as they said, just invert it for the other side.

Oh it's that easy :)
Thank you all for your answers, problem solved!

(I should've looked around a bit before posting here...)

It's ok, that's what where here for:thumbsup: