How did you attach the circles? I was given a bag of circles and some of them are already attached but I can't figure out what they did to fill in the gaps, It looks like stars.
I'm very bad at crochet talk but maybe this will make some sense, i'll try my hardest.
in each circle i ended up with 12 sets of 3 dc's. to make it squarish you ch 2, 2dc, then ch 1, 3dc in the same space. then ch 1 and move to the next space. 2dc, ch 1, move to the next space, 2dc, ch 1, move to the next space, 3 dc ch1 3 dc in the same space. and keep doing this. So the (3 dc, ch 1 3dc) become your corners.
sad drawing because my explanation is trying.
So when you are joining you join them where you would ch1.
Here is the pattern toohttp://www.stitchnationyarn.com/Patterns/copenhagen-pillow.html