Tomahawk (geometric shape)
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Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. The tomahawk is a "tool" in geometry consisting, in essence, of a semicircle and two line segments. The basic shape is constructible with compass and straightedge. It is possible to trisect an angle with the tomahawk. This does not contradict the usual theorem stating that an arbitrary angle cannot be trisected by compass and unmarked straightedge, alone, as translating the constructed tomahawk into the required position is not a Euclidean construction.

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Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. The tomahawk is a "tool" in geometry consisting, in essence, of a semicircle and two line segments. The basic shape is constructible with compass and straightedge. It is possible to trisect an angle with the tomahawk. This does not contradict the usual theorem stating that an arbitrary angle cannot be trisected by compass and unmarked straightedge, alone, as translating the constructed tomahawk into the required position is not a Euclidean construction.