How do I draw these lines in Illustrator?

Question

I am trying to reproduce a poster I found, but I don't know exactly how to reproduce these concentric red lines inside the black circle.

I tried to use spirals but it didn't quite do the work. I could draw one by one but I am sure there is a better way!

Answer 1

This is an interesting question because there are several ways this could be done. Here's another method, using only three paths.

1. Drop a horizontal and vertical guide to give you a centre origin. Lock the guides.

2. Draw a circle centred on the origin, then fill it with purple, add a red stroke.

3. Using the Arc Tool - draw a single arc that fits to the edge of the circle, stroke red, no fill. Then click Object > Arrange > Send to Back

4. Using the centre origin again, draw a black circle, no fill, thick black stroke.

5. Then group everything.

6. Now, open the Appearance panel, and click on the fx button, and click Distort & Transform > Transform

7. Set the rotation angle to 45, copies to 7, enable the preview option to see it. Click OK to accept.

Answer 2

1. Draw an ellipse

2. Duplicate it (= drag horizontally holding Alt) Have the Smart Quides ON to be easily able to move only horizontally

3-4. Take the direct selection tool and delete 2 anchor points from each. Group the remaining quarters to keep them together.

5. Goto Object > Transform > Rotate, -45 degrees, Copy

6. Repeat 2 times by pressing Ctrl+D

7. This is optional (no image) Goto Object > Transform > Reflect > Vertical if you want to change the apparent rotational direction.