The half square triangle unit is probably the most commonly used patch in a quilt block -- well it is second only to the square. It is made simply with two triangles, filling up half the square each -- hence the name. Take a quick look through this website, or in any quilting magazine, and you will start to notice that this half square triangle, regardless of its size, is present in more quilts than not.
Jack in the Box
Free Quilt Block Pattern
The Jack in the Box quilt block pattern is an old and well established block. It is easy to construct and features large flying geese units and half square triangles. This is a wonderful four patch quilt block for beginners to get started in this addictive hobby.
The sample quilt layouts illustrated show the quilt blocks laid out either in a straight set, or on point. Note that an additional fabric has been added to the on point setting just to add more interest.