Looking at it closer, it doesn't look like it's a log cabin.
Here's what I think is done.
1.Take triangle (plain color)
2.take strip of fabric, sew to left side of triangle...point of triangle pointed up (handle color)
3.take another strip (handle color) sew to right side of triangle
4.take strip of fabric (plain color) sew to left side
5.take strip of fabric (plain color) sew to right side.
This SHOULD give you a triangle the same size as the bottom (basket) if you measured everything.