Yes! It is!
I'm not perfectly sure how, but my father has, in fact, done this.
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True
True
No, and the proof was provided by Wantzel in 1837.
Yes and the trisections will form 4 angles of 22.5
It is indeed impossible to trisect an angle using only a [pair of] compass[es] and a straight edge.It is in fact possible:1) measure the angle2) divide this measure by three3) measure the angle found in part (2) inward from the outer edge of the main angle4) use the straight edge to draw the trisectorsit is!!!!!!!!!!!!!!!!!!