The idea is to cut a 2x4 into an equilateral triangle 60-60-60 with each side being roughly the width of the 2x4 (no idea what the length is).
If it is long, they the table saw set to the angle will cut the stick the length and then reset for the opposite side.
If it is short, then a miter saw could do the trick... though the table saw might still be the safest means; hard to say without seeing the piece.
The laminated ply would be more stable as it dries.
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