Angle trisection
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Angle trisection is the construction of an angle equal to one third of a given arbitrary angle, using only two tools: an unmarked straightedge and a compass. It is a classical problem of straightedge
Rulers. The displayed ones are marked — an ideal straightedge is un-marked
Compasses
Squaring the circle
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Squaring the circle is a problem in geometry first proposed in Greek mathematics. It is the challenge of constructing a square with the area of a given circle by using only a finite number of steps wi
Angle trisection
…construct squares of equal or twice the area of a given polygon. Three problems proved elusive, specifically, trisecting the angle, doubling the cube, and squaring the circle. The problem of angle trisection reads: Construct an angle equal to one-third of a given arbitrary angle (or divide it into three equal angles), using…
Heisel's 1934 book
Vitruvian Man