: How to make a circle with grid on the outside ring I made something like this: I did this with the Ellipse Tool and the Line Tool. Now the circle is accurate, but the lines inside are

@Berryessa866

What about starting off with Polar Grid? Really surprised haven't seen that suggested.
Double click on the tool and type in the number of Radial dividers.
Very quick - ungroup a few times,
divide
or shapebuilder tool (with alt to remove)and thats it.

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@Ann6370331

Another Smarter answer (just to enrich the answers) to use just one circle and to take advantage of the appearance tool.


Draw a simple circle
open the appearance panel by going to Windows > Appearance or just click SHIFT + F6
Now select the circle you have just drawn and make the herunder setting, or just make the values that you want. make sure to click on dashed lines and add the values that you want.





From the appearance panel add a stroke by clicking the Add New Stroke button
and uncheck the dashed button.
we still on the Appearance panelnow step over the last stroke that you have done and click over Duplicate Selected Item, this step will make another strok exactly over the last one you did.





Now we will scale both last two strokes to wrap the dashed lines of the circle.
We still on the appearance Panel Select the first stroke and click add new effect > Distort & transform > Transform ... and adjust the values the way you want.





Repeat the last step of the other stroke but that time with minus scale values





after all it is just one circle with three different strokes style. go to View > Outline or just click Ctrl + y to activate the outline view. You will notice it is just one circle.

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@Nimeshi706

Please follow these steps:


Draw a Line from the line tool or press





Open appearance panel or press SHIFT+ F6
Apply the hereunder setting, those setting will array the line "Polar Array" we will copy the line over itself and rotate each copy 10° and we will copy it 17 times. You can adhust the values the way you want it.

Now we will draw two circles on for the external boundaries and one to hide the center of our last array.





That's it

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@Nickens508

This is not the fastest method, but it is the easiest to understand for novices. And has these added advantages:


You can make unequal parts as well as equal parts. Just input different numbers in the pie chart data dialog.
When using Divide you can keep the inner parts if you'd like to use them later on in your design.





Get yourself some pie. Then open the pie chart tool and create a pie chart with the desired number of 'blocks'.
OPTIONAL Make a duplicate of the pie chart and hide the original. This way you'll have a back-up if anything goes wrong later.
Ungroup (ctrl-shift-g) the pie chart.
Create a circle the size of the desire hole in your soon-to-be doughnut chart. Position the centre over the centre of the pie chart.
Select both ungrouped pie chart and circle and use minus front from the pathfinder dialog. Or use divide to keep the pieces if you want to use them later or if you want more control.
Delete the parts you don't want. Sometimes you need to do a little cleanup.

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@Vandalay110

Draw 2 concentric circles
Draw a connecting line (w. line tool for example)
Enable rotate tool (with line selected) and alt click on the center of circle.


Type in a value in degrees that is a divisior of 360 (2, 3, 5, 6, 10, 15, 20 etc)
Hit duplicate

Keep hitting ctrl+d (repeat last) until a full revolution is done.




Image 1: Timelapse of description above.

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