7. A quadrangle is a Parallelogramme, or a Trapezium.
This division also in his parts is in the Elements of Euclide, but without any forme or shew of a division. But the difference of the parts shall more fitly be distinguished thus: Because in generall there are many common parallels.
8. A Parallelogramme is a quadrangle whose opposite sides are parallell.
As in the example, the side ae, is parallell to the side io: And the side ei, is parallell to opposite side ao.
Therefore
9. If right lines on one and the same side, doe joyntly bound equall and parallall lines, they shall make a parallelogramme.
The reason is, because they shall be equall and parallell betweene themselves, by the [26. e v].