This quilting technique fromQuilting Blocks & Patternson Youtube will help you, especially if youre new to quilting.

This tutorial will teach you two methods on how to square up a half-square triangle block.

Its quick, easy, and a clear method of how to do this properly.

How to square up a half square triangle block

Image credits: Quilting Blocks & Patterns via Youtube

Watch the video tutorial below to learn.

Do the same on the other end.

Now, cut the excess fabric.

Squaring up a half square triangle with a 45 degree angle ruler

You have now a 66 block.

How To Square Up A Half Square Triangle Quilting Block

Squaring up a half square triangle with a straight ruler