Yes and the trisections will form 4 angles of 22.5
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True
True
No, and the proof was provided by Wantzel in 1837.
No
False. It is impossible to trisect any angle using only a compass and straightedge, as proven by Pierre Wantzel in 1837. While some angles can be trisected using these tools, the general case for all angles cannot be achieved through classical construction methods.