: Circle with inner rings of equal area? I'd like to create a circle with rings of equal area (as opposed to rings of equal thickness). The inner ring ends up being a filled circle, and there

@Shelton719

If you start with the disc in the middle, you know its radius in pixels: R_red. The area A of the disc is

A=pi*R_red**2.

A is also the area of the green and blue area, respectively. Therefore, the outer radius of the green ring belongs to a disc with area 2*A.

R_green = sqrt(2*A/pi)), and consequently

R_blue=sqrt(3*A/pi)).

So, R_green is sqrt(2) times bigger than R_red, and R_blue is sqrt(3) times bigger than R_red.

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@Voss6371140

in adobe illustrator :
draw the circle in any size you want , then copy it.
after that past in the same place and use the selection tool (v) to re-size it with keep clicking on alt with shift buttons.
copy the new one and past it in the place and then click on Ctrl+D 2 times.

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@Gail6891361

Some one did ask a similar question on Mathematics SE -> How to divide a circle into 9 rings / 1 inner circle with the same area?

You will have to adjust the equation a bit.

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