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Designer was used in the video and I’m pretty sure that the same workflow can be followed in all the Affinity applications but you will have to use the relevant menu choices for the Geometry operations instead of the Designer toolbar buttons. https://en.wikipedia.org/wiki/Reuleaux_triangle Here’s how you can create a Reuleaux Triangle, see attached image and video below. (Apologies for the non-technical imprecise language.) 1. Make sure you have Snapping ON (you may need to put more snapping options ON than you normally have). 2. Draw a line which will be the bottom two points of the triangle. 3. Draw a circle with CTRL+SHIFT from a centre at one end of the line so that the edge of the circle meets the other end of the line. 4. Draw another circle the same way but from the other end of the line. 5. Draw a line from where the two circles intersect at the top to one end of the line. 6. Use the Move Tool (with SHIFT pressed) to resize the new line so it crosses the circle completely. 7. Draw a new circle with a centre at the intersection of the two circles at the top until the side of the new circle snaps to the same horizontal position as the end of the new line. 8. Delete both of the lines. 9. Select two circles and use Geometry Intersect. 10. Select both remaining shapes and use Geometry Intersect again. The attached image shows some examples of using the corner tool on the shape and some effects (Martin’s “Golden boy”). 2020-03-03_12-45-53.mp4