Letter 5mm Triangle Grid Paper PDF
Letter portrait | 5mm triangles | Point up
Letter landscape triangle grid paper
Letter Landscape 10mm Flat-Base Triangle Grid Paper PDF
This Letter landscape template uses equilateral triangles with 10mm sides and a flat-base starting phase created by shifting the first diagonal row on a 8.5 x 11 inch page. It is ready to download, print, or customize.
- Paper
- LETTER / Landscape
- Format
- PDF / PNG
- Triangle side
- 10mm
- Layout
- Flat base
Template details
About this landscape US Letter 10mm flat-base triangle grid
US Letter is the standard everyday paper size for most home, school, and office printers in the United States and Canada. Each equilateral triangle has 10mm sides and a perpendicular height of approximately 8.7 mm.
The flat-base option shifts the first diagonal row by half a triangle side, changing the phase visible at the upper grid edge. The centered grid area is approximately 250 x 190.5 mm, with 25 x 22 side-width and row-height intervals forming about 1,100 complete or edge-clipped triangular cells.
- Paper size
- 8.5 x 11 in (215.9 x 279.4 mm)
- Triangle side
- 10mm
- Grid area
- 250 x 190.5 mm
- Triangle cells
- about 1,100
Why use US Letter 10mm triangle paper?
A 10mm triangle grid provides larger cells for bold constructions, labels, classroom demonstrations, quilting layouts, and designs that need more drawing room.
Geometry and tessellations
Use the three 60-degree line directions for equilateral triangles, rhombi, hexagons, symmetry exercises, transformations, and repeating geometric patterns.
Patterns, crafts, and maps
The 10mm triangles support quilting plans, bead and mosaic patterns, triangular maps, pixel-style designs, and technical sketches built from equal-sided units.
Flat Base layout on US Letter
The flat-base option shifts the first diagonal row by half a triangle side, changing the phase visible at the upper grid edge. The geometry stays the same, so choose the phase that makes the top of your drawing or pattern easiest to begin.
US Letter vs A4 10mm triangle paper
Both formats preserve the same 10mm side length and flat-base starting phase. Choose US Letter for us home, school, and office printing; choose A4 when international home, school, and office printing better matches the printer or project.
Open A4 10mm flat-base triangle paper →| Comparison | US Letter | A4 |
|---|---|---|
| Page size | 8.5 x 11 in (215.9 x 279.4 mm) | 210 x 297 mm (8.27 x 11.69 in) |
| Grid area | 250 x 190.5 mm | 270 x 181.9 mm |
| Grid intervals | 25 x 22 | 27 x 21 |
| Triangle cells | about 1,100 | about 1,134 |
Print US Letter triangle grid paper at the correct scale
Use the PDF when the physical triangle dimensions matter. The side length and 60-degree geometry are preserved when the printer uses the correct paper and scale settings.
- 1
Load US Letter paper
Load 8.5 x 11 inch paper and select Letter as the paper size in the print dialog.
- 2
Use Actual Size
Select Actual Size or 100% scale. Turn off Fit, Shrink, and Scale to Page options.
- 3
Match landscape orientation
Keep the print dialog set to landscape so the grid is not rotated or reduced automatically.
- 4
Check one triangle side
Use a ruler to confirm that one horizontal triangle side measures 10mm.
More Letter Triangle Grid Paper Templates
12 ready-made templates are available for this paper size.
Letter Landscape 5mm Triangle Grid Paper PDF
Letter landscape | 5mm triangles | Point up
Letter 5mm Flat Base Triangle Grid Paper PDF
Letter portrait | 5mm triangles | Flat base
Letter Landscape 5mm Flat Base Triangle Grid Paper PDF
Letter landscape | 5mm triangles | Flat base
Printable Triangle Grid Paper Letter PDF
Letter portrait | 6mm triangles | Point up
Letter Landscape 6mm Triangle Grid Paper PDF
Letter landscape | 6mm triangles | Point up
Letter 6mm Flat Base Triangle Grid Paper PDF
Letter portrait | 6mm triangles | Flat base
Letter Landscape 6mm Flat Base Triangle Grid Paper PDF
Letter landscape | 6mm triangles | Flat base
Letter 10mm Triangle Grid Paper PDF
Letter portrait | 10mm triangles | Point up
Letter Landscape 10mm Triangle Grid Paper PDF
Letter landscape | 10mm triangles | Point up
Letter 10mm Flat Base Triangle Grid Paper PDF
Letter portrait | 10mm triangles | Flat base
Letter Landscape 10mm Flat Base Triangle Grid Paper PDF
Letter landscape | 10mm triangles | Flat base
FAQ
Answers specific to printing 10mm flat-base triangle grid paper on US Letter.
What does 10mm triangle size mean?
The listed size is the length of every side of each equilateral triangle. Its perpendicular height is approximately 8.7 mm.
How many triangles fit on US Letter paper?
This landscape template forms about 1,100 complete or edge-clipped triangular cells inside a centered 250 x 190.5 mm grid area.
What is the difference between point up and flat base?
Both options have identical triangle dimensions and line directions. Flat base shifts the first diagonal row by half a side, changing which phase begins at the upper edge of the grid.
Which print setting keeps the triangles true to size?
Select US Letter paper, use Actual Size or 100% scale, and disable Fit to Page. Then verify that one horizontal side measures 10mm.
Should I use portrait or landscape US Letter triangle paper?
Portrait works well for worksheets, vertical patterns, and notebook-style diagrams. Landscape provides more horizontal room for wide constructions, maps, quilts, and classroom demonstrations.