Looks like a strip quilt. Sew WOF together to make the height, then use a wedge ruler to cut units (one up, one down) in this case there are 8 wedges for the circle (360 deg) so 360/8 is 45 deg. BTW- you'll need to add the "corners" to make it square, but that is easy enough to do with strips.
I've got this pattern, or one very similar and it's very easy to sew. Also jelly roll friendly. And if you want more interest, you can vary the width of the strips.
It's very similar to a spiderweb quilt.