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Wednesday, March 3, 2021

Side Triangle and Corner Triangle Cutting Cart


Quilters use this triangle cutting chart when piecing a diagonal layout quilt. In a diagonal layout, blocks are placed on-point. The blocks are shown in white above. The corner triangles, shown in black, are in the corners. Side triangles, shown in gray, are along the edges.  

Cutting Triangles from Squares

This triangle cutting chart is based on cutting squares then sub-cutting the squares into triangles. 

Cut the square twice diagonally for side triangles.

Side Triangle Cuts

Cut the square once diagonally for corner triangles

Corner Triangle Cuts

Why Cut Triangles from Squares?

Squares are easy to cut. First, cut along the width of fabric. Next, sub-cut into squares. Finally, sub-cut the squares into 2 or 4 triangles. Cutting squares this way ensures the grain lines follow the outer edges of the quilt. The picture below shows the grain lines for the side triangle cuts. These cuts put either the crosswise or lengthwise grain along the outside edges of the quilt.

Next we have a picture of the grain lines for the corner triangle cuts. These cuts also put the grain lines along the outside edges of the quilt.

How to Use the Triangle Cutting Chart

I suggest you cut test squares to make sure you are cutting the correct size. I like to make my squares about an inch larger then cut them down later.

Step 1 - First, find the finished block size in column 1.

Step 2 - Next, find the corresponding number in column 2. Cut squares to this size in inches. One square gives you 4 side triangles. Step 3 - Finally, find the corresponding number in column 3. Cut 2 squares to this size in inches. One square gives you 2 corner triangles.

NOTE: When in doubt about what size to cut, always round UP just to be sure. You can always trim it down later.

Triangle Math

If you prefer to do the math yourself, here are the formulas:

Side Triangles

(Finished block size in inches x 1.414) + 1.25"

Corner Triangles

(Finished block size in inches / 1.414) + .875"


Happy quilting!

Carol

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