No easy magic that I know of. I would start like this, splitting the cardboard into five pieces.
cardboard_2023Jun23a.gh (28.9 KB)
Then rotate four sides 90 degrees around the appropriate line.
Cut the long sides (green and yellow) by the 4 lines that are 43.46 units long and rotate the ends 45 degrees.
Cut the rotated ends by the 4 lines that are 45.18 units long and rotate them another 45 degrees.
But now that I look more closely, the blue and red ends are not square so those are not 45 degree angles, so it isn’t as easy as it looks. 
