Quilter's Rule™ makes this clever marking guide.
Use the slotted center to mark cut lines, then marking along the outside of the guide for stitch lines gives you two perfect half-triangle squares. Easy as pie!
Making multiple half- or quarter-square triangle blocks or Flying Geese blocks are a breeze - no cutting or piecing.
You'll wonder what you ever did without it!
Read about this tool in our Favorite Tools, Vol. 1 - The Basics blog on Cozy Chatter.