Hello cats252,
I would suggest that you need some relief. I mean around the two sides that are to be cut. Add an operation to cut a round slot along both sides of the triangle all the way back to just beyong the bend line on each end. A standard practice is to line up the center of the slot with the bend line on both ends.
Then, that will open up the inner triangle to become a flange that can then be bent 90 degrees. You see, it appears that you have the two sides of the triangle "sheared" out of the stock when there should actually be a relief along each side. refer to the attached image mark-up from your image.
Design Concern:
Taking so much out of the second bend concerns me as a designer. It will weaken it considerably. What is the the triangluar flange for, to help support the other flange? If so, there is a better more acceptable way to do this. To strengthen a bend, standard practice is to "punch a gusset into the 90 degree bend of the square flange. This strengthens the bend considerably and does not remove "any" material.
Good Luck!
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