How to draw a triquetra using a right-angle triangle

So let’s get to it!

Drawing pencils
Markers
Blending stumps
Eraser
Click eraser
Ruler
Horse hair brush
Grid paper
Sketch pad
T-square or L-square

Draw a triangle creating one 90˚ corner. if you’re a confident drawer you can freehand. Or you can use a straight-edge or L-square to get an accurate angle. Draw your triangle large enough to accommodate overlapping details and negative space between them. The two lines that form the corner can be any length you desire and don’t have to be the same length. Different lengths will produce interesting variations in your triquetra.

Draw a half-circle or arc from one corner, around the triangle’s center point, and end in the opposite corner. (You can guestimate the center of the triangle but if you’d like to know how to find the exact center of a triangle check out my YouTube video or blog tutorial.)

Follow the same steps to create the other two arcs. 

Now that you have the basic single line of the triquetra, draw offset lines to make the line into a thread. These lines will run parallel to the lines drawn and can be above or below the single line. Your thread can be as thick or as thin as you like. The only caution here is to leave enough space in the center for the over and under weave.

Now it’s time for the alternating overs and unders. Pick one point of intersection and decide which thread will go over the other. Erase lines you don’t need. Follow that thread to the next intersection and do the opposite—if you went OVER the first intersection you will go UNDER this intersection. Move on to the third intersection. If you went UNDER the last thread go OVER this one. Follow the thread back to the beginning and check that you have properly woven your thread alternating overs and unders.

Erase all unnecessary guidelines, darken your lines, and stylize!