Equilateral triangles are the same length on each side, with 60-degree angles at each of their three corners. They are used in many ways, but a popular layout for equilateral triangles is the 1000 Pyramids quilt.
How to Cut Equilateral Triangles
- Using the finished size, measure the distance from the midpoint of triangle's base to the tip of the point above it.
- Add 3/4" to the measurement and cut a fabric strip of that width.
- Align the 60-degree line of a rotary ruler with the long edge of the fabric strip as shown above.
- Cut along the right edge of the ruler to establish the first edge of the triangle. Discard the piece you cut off or throw it in your scrap bag.
- Rotate the ruler, aligning its other 60-degree line along the bottom edge of the strip. The edge of the ruler should be positioned to form a "point" at the bottom edge of your first cut.
- Cut along the right side of the ruler to create a triangle. Measure it. All three legs should be the same length--7/8" longer than the triangle's finished size.
- Continue flip-flopping your ruler to cut more equilateral triangles. Check their dimensions occasionally to make sure the angles and leg lengths are still accurate.