Half-square triangle quilt block

Also called HST, Triangle square.
A square cut corner to corner in two fabrics — turned different ways it makes zigzags, pinwheels and stars.
Beginner

Cutting chart

For one block. Sizes are cut sizes, ¼ in seams included.

4 in block

Dark: 1 square for half-square triangles 4⅞ in
Background: 1 square for half-square triangles 4⅞ in

6 in block

Dark: 1 square for half-square triangles 6⅞ in
Background: 1 square for half-square triangles 6⅞ in

8 in block

Dark: 1 square for half-square triangles 8⅞ in
Background: 1 square for half-square triangles 8⅞ in

How it goes together

Trim each unit square, then turn them to make the pattern you like before sewing the rows.
Plan a quilt with this block
Pick a size — get every cut and the fabric to buy.

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