top marker is green

set up triangle and big square took 84gm

proportions are
small squares : big square : big triangle
1:2:4

I think if you knit 4/7 of your yarn into the big triangle, then you can use up all your yarn.

Could also try an extra stitch in the middle of the triangle and big square.

T = 120
SN=T/8-2
= 120/8 - 2
=15 - 2
= 13

23 apr 21 - am 26 sts per side into large square. Need to get to 29.