Half rectangle triangles are not as straightforward to make as half square triangles. I see on the internet that they are often called HRTs, but I’m not going to call them that in case you think that I’m losing it and talking about hormone replacement therapy!
You can buy templates for making half rectangle triangles or you can use a method that involves measuring points beforehand, but I believe that this is the most simple method to use. The drawback is that it gives you two half rectangle triangles which are mirror images of each other. For this reason I am going to follow this tutorial with two different projects that will use up both of the versions.
Rectangle size for half rectangle triangles
The sizing is similar to that used for half square triangles – add 7/8″ to both measurements of the finished size half rectangle triangle that you want. I need 3″ by 6″ finished size units, so I am starting with rectangles that are 3.7/8″ by 6.7/8″.
How to make half rectangle triangles
Cut the rectangles along one diagonal as shown on the far left of the photo. Place a red triangle with a white triangle to make a rectangle shape.
Flip one triangle on to the other one so that they are right sides together. Note that I have lined up the edges so that there is 1/4″ of the white triangle sticking out at the top and 1/4″ of the red triangle sticking out at the bottom.
Using a 1/4″ seam, sew the two triangles together. Press the seam allowance towards the red and trim the two corners where the triangle tips stick out.
You will find that you have two different half rectangle triangles. Ignore the pair of units on the far right of the photo – I have shown you two the same there. If you look at the photo at the top of the page you’ll see that in one the red tapers to a point at the top right and in the other the red tapers to a point at the top left. This means that if you want sixteen half rectangle triangles of one type you will need to use sixteen rectangles each of red and white and you will end up with thirty two half rectangle triangles, sixteen of each type.
I am working on two projects at the moment, one to use each variation of the half rectangle triangles, and I will show these to you as soon as I can.
Here’s the video:
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