Creating Quarter-Circles in Adobe Illustrator
Here’s a quick way to draw a quarter-circle in Adobe Illustrator. It involves using just one tool: the arc tool.
These instructions will work in Adobe Illustrator from CS–CS5.
How to create a quarter-circle (or quarter-ellipse) in Illustrator
- Select the arc tool. (Click and hold the straight-line–segment tool to bring up the sub-menu of additional line-segment tools)
- Use the arc tool to make your quarter-circle:
- A. Freehand method
Before drawing a freehand quarter-circle for the first time, you must use the exact-size method to enable closed-shape drawing. If you do not, you will only get the curved line, not the whole the shape.
Quarter-circle: Hold down the shift key on your keyboard, click and drag to draw a quarter-circle of the desired size.
Quarter-elipse: Click and drag to draw a quarter-elipse of the desired size.
- B. Exact-size method
- Click once anywhere on your artboard to open the arc tool options dialogue.
Type in your desired dimensions for the radius of your quarter-circle, and select Closed from the Type drop-down. If your y-axis and x-values are equal, you will be drawing a quarter-circle, but if they differ, you will draw a quarter-ellipse.
- Success. You now have a quarter circle. You can change the fill, size, stroke, etc as with any other shape.