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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) ...


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The Shift key constrains proportions. If you start with an oval, it will continue to be an ellipse as you scale it. To turn an ellipse into a circle, or a rectangle into a square, adjust the height and width properties manually (be sure that auto-keyframe is turned off if you don't want to make this part of an animation) so they are the same.



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