Angular Granny Throw
From the Description: A three-sided twist on the traditional granny square, triangle motifs fit together to make this classic throw geometrically modern.
Yardage: 4 skeins, 1456 yds of Super Saver Economy (A) and 4 skeins, 1264 yds of Red Heart Fiesta (B)
Gauge: motif = 6.5” diameter, (7.25” along each side)
Free version has an assembly diagram but not a chart. There is a chart for the crochet pattern in the magazine, as well as written directions.
Also at Knitting Daily