The respondent was asked, Do you know that every Dyad is even?
Some Dyad was then produced, which the respondent did not know to be a Dyad; accordingly he did not know it to be even.
When you say a line, do you mean a dyad in length Form in Matter?
For either the dyad is not One; or else the monads included therein are not monads ἐντελεχείᾳ (a. 14).
There being six pairs of parallel edges on an octahedron, there are consequently six dyad axes of symmetry.
They are parallel to the edges of the cube, and in the different classes coincide either with tetrad or dyad axes of symmetry.
The other elements of symmetry (six dodecahedral planes and six dyad axes) are the same as in the last class.
There are five axes of symmetry, one tetrad and two pairs of dyad, each perpendicular to a plane of symmetry.
Here there is only one dyad axis in which two planes of symmetry intersect.
Here there is a single plane of symmetry perpendicular to which is a dyad axis; there is also a centre of symmetry.