Quilt in a Day Forums

Need help please with half square triangles. Is there a universal formula to use to make these little guys?? Is there a helpful ruler to help?? I wanted to do something with 3 inch finished squares like a nine patch and place the triangles on the sides and just don't know if I saw this pattern on you tube or just made it up in my non mathematical mind. Any help would be greatly appreciated.
Thanks and hugs,
TinaB
Patches4

MANY THANKS!! for some reason 7/8 was floating around in my head but did not know why. Have a great day.

Tina, cut your squares 7/8 in larger than your finished squares. Good luck with your HST blocks.

Mary/Rosebud

I think on Missouri Star Quilt Company is where they have the tutorial to cut a square and sew around it and through it or something, anyway you get 4 or 8 at a time.
Tina