# Half Square Triangle (HST)

## Half Square Triangle (HST) Block Unit in PreQuilt As a foundation block unit, it's great to nail this one down! And since the idea behind this series is to build a block unit (not an entire block that is just a half square triangle), I'm going to create a 12" finished block that has half square triangle block units in it (like for example, the **Shoofly** quilt block). *** ### YouTube Video *Coming soon...* *** ### Help Guide 1. Click on the **BLOCKS tab** on the left side control panel.

2. Click on the **Make Custom Block** button.

3. The **Block Editor panel** will slide out and overtake your screen. My block is set to 12" x 12" finished, but it doesn't matter, the next steps will work for all sized blocks. 4. Set your grid guidelines by changing the number for the horizontal and vertical units. * Since I'm going to be creating the **Shoofly** quilt block, I'll set my gridlines to 3 horizontal and 3 vertical units.

5. Click on the **half square triangle shape** (

) from the central control panel. 6. One half square triangle will be added to the block space. **Move** it into the correct position by clicking on the shape on the block space and moving it to where it belongs.

HST shape added to the quilt block space

7. We now have one half square triangle that fills one ninth of the quilt block. * Keep in mind this is only half of the block unit, the other half is empty (denoted by gingham background). 8. With the half square triangle shape selected, click on the **Clone button** (![](https://667278489-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FPUFswdysHBJDPIJC9xe0%2Fuploads%2F2pQdYw3yn0w3jGirpIZM%2FClone.png?alt=media\&token=19516272-01c1-4426-adbf-2dcca0b50236)) on the central control panel.

Cloned HST shape - identical to the first HST (Using Fabric Link A)

9. Click on the **Link button** for a different fabric link (so that there are 2 different fabrics being used in your half square triangle block (unit).

Cloned HST shape - now using Fabric Link C

10. Click on the **Rotate button** (![](https://667278489-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FPUFswdysHBJDPIJC9xe0%2Fuploads%2FGR6TNyrDdrPEBMQ1kC2G%2FRotate.png?alt=media\&token=dee9dfad-4200-4439-9f46-abdcffb41cdf)) on the central control panel so that it is in the correct orientation.

11. **Move** the new half square triangle piece so it fills the empty half of the quilt block unit. It should snap into place and be snug with the first half square triangle piece.

*** ## Sewing Construction Diagrams ### 2 at a Time Method

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