Spirals

Tip from Ivan Louette

The idea is "clone/rotate/scale" one straight line around a center located at one of its extremities. You can easily reach that with your settings on "snap to objects"; then you move the rotation center of your line to its extremity. It's important to select "lock aspect ratio" and to type your scaling when rotation handles are selected. When you have several lines it's possible to group them, rotate around the same center and scale them several times till the group reach the good size.
After, use Shape editor with "smooth angles" and "make curves" selected to draw your curve, snapping it to the lines.
You can also place groups of lines at the angles of a quadrangle.

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