oboy I need help UGH!
 

ok here goes..... I made a bunch of pinwheels they are 3 1/2 inch sqr unfinished I want to set them in a diamond shape I am going nuts trying to figure out what size square to cut so I can get 4 triangles to go around thanks so much

Try this calculator:

http://www.quiltersparadiseesc.com/Calculators/Square%20in%20a%20Square%20Calculator.php




http://piecemealquilts.com/2011/06/1...ond-in-square/