Angle a Channel

Hello Everybody!

I have a simple solid 3 x 4 x .75 (inch) thick part.  I've been able to cut a .5 wide x .25 deep channel across the piece at a 90 degree angle from the right side (through all). My question: how can I get the channel to angle at 105 degrees, instead of 90 degrees?

Thanks for the help

Charles

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