Of the quadrangles the Trapezium remaineth for the last place: Euclide intreateth this fabricke to be granted him, that a Trapezium may be called as it were a little table: And surely Geometry can yeeld no reason of that name.
The examples both of the figure and of the measure of the same let these be.
Therefore triangulate quadrangles are of this sort.
12 A multangle is a figure that is comprehended of more than foure right lines. 23. d j.
By this generall name, all other sorts of right lined figures hereafter following, are by Euclide comprehended, as are the quinquangle, sexangle, septangle, and such like inumerable taking their names of the number of their angles.
In every kinde of multangle, there is one ordinate, as we have in the former signified, of which in this place we will say nothing, but this one thing of the quinquangle. The rest shall be reserved untill we come to Adscription.
13 Multangled triangulates doe take their measure also from their triangles.
As here, this quinquangle is measured by his three triangles. The first triangle, whose sides are 9. 10. and 17. by the [18. e xij]. is 36. The second, whose sides are 6, 17, and 17. by the same e, is 50.20/101. The third, whose sides are 17, 15. and 8. by the same, is 60. And the summe of 36. 50.20/101. and 60. is 146.20/101, for the whole content of the Quinquangle given.