However, it is constructible using neusis, or an angle trisection with a tomahawk. Perigal also propose the first 6-pieces solution to the square trisection problem. Angle (left of point ) is the subject of trisection. Far from being minimal, the square trisection proposed by Abu'l-Wafa' uses 9 pieces. The trisection of an arbitrary angle using only ruler and compasses is impossible. For instance paper folding may be used for angle trisection and doubling the cube. The trisection of the angle was one of the three famous problems of antiquity. Angle trisection is a classical problem of compass and straightedge constructions of ancient Greek mathematics.