1. Tools: circle tool to draw circles, and the Command- Trim to trim the shape Reflection: how to use the Trim tool in two ways. I can select the object used for cutting first, then select the object that needs to be cut. Or I select everything at the beginning and click the lines I want to cut. 2. Tools: Square Tool, Command- Trim, Curve Tool or Arc Tool Reflection: I am not sure whether the example requires me to use the Curve or Arc tool, I assume there are tools like making rounded corners from squares which can be adjusted directly. 3. Tools: Circle Tool, Command-Rotation, Command-Trim Reflection: I typed 45 degrees every time in the Rotation. I am wondering is any quick tool I can repeat the last step 4. Not successful yet Tools: Reflection: I don't know how to do the tangent curve yet 5. Not successful yet Tools: Reflection: I am stuck in here. Lines can't be joined....