Welcome back to Quilts by Jen.

Today I am going to talk about cutting rectangles into half square rectangles which essentially create two triangles with one being a left triangle and the other a right triangle. The triangle created has 3 unequal sides which is called a scalene triangle.

Follow these steps for cutting right and left triangles which are needed when creating odd angle flying geese.

Same Fabric Triangles

If using the same fabric for both triangles then two rectangles can be placed wrong sides together on the cutting mat.

blue fabric and grey fabric underneath on green mat
Same fabric – place wrong sides together

Cut from the bottom corner on a diagonal to the top corner as indicated by the ruler and arrow in the photo below. You can also cut on the diagonal from the other corners and get the same result.

red arrow and ruler placed on a diagonal on a blue piece of fabric
Cut on diagonal from bottom corner to top corner

Two left triangles and two right triangles.

4 blue triangles on green mat
2 left and 2 right triangles

Different Fabrics for Triangles

If using two different fabrics for the triangle units in the geese block then they will need to be cut specifically for a right and left triangle.

Right Triangle

Place the rectangle right side up on the cutting mat.

grey fabric on green mat
Dark Grey rectangle right side up

Place ruler on rectangle and cut as per arrow in photo below – from the bottom left corner to the top right corner.

ruler on a diagonal on a rectangle
Ruler placed on diagonal from bottom left corner to top right corner

Two right triangles are created.

two grey triangles on green mat
Two right triangles

Left Triangle

Place the fabric right side up on the cutting mat.

grey fabric on green mat
Medium grey rectangle

Place ruler on rectangle and cut as per arrow in photo below – from the bottom right corner to the top left corner.

red arrow and ruler on grey fabric on a green mat
Ruler placed on diagonal from bottom right corner to top left corner

Two left triangles are created.

grey triangles on green mat
Two left triangles

These half square rectangles are needed for making odd angle flying geese. Check out my tutorial where you can use these triangles to make odd angle flying geese.

Until next time…

Happy Quilting

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