Hot answers tagged shapes
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) ...
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.
I use the pencil eraser in brush mode. Under the brush panel make sure the only boxes checked are Smoothing and Dual Brush, and it should show a mostly solid white brush preview. The brush with these settings should act just like "block mode" and erase everything under it. You probably already figured something out by now but oh well.
Easy one. Enter Free Transform mode (Edit > Free Transform or CMD+T) and, at the top of your window, you will see these boxes: Where you see "100%" in the width and height, simply enter the pixel value that you wish it to be: Hit Enter until your changes are applied.
This may not be the most elegant solution, but working in Illustrator is all about problem solving. My suggestion would be to place two extra lines on the edges of the square, for the vertical lines, one on the exact right and one on the exact left, then dropping your two original lines pretty much anywhere in between. Then select all four lines, switch to ...
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