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If a parallelogramme and a triangle haue one and the selfe same base, or equall bases the one to the other, and be described on one and the same side of the base: ••f the parallelogramme be double to the triangle, they shalbe in the selfe same parallel lines.
* 1.1For if they be not, the whole shalbe equall to his parte. For then the toppe of the triangle must nedes fall either within the parallel lines or without. And
whether of both soeuer it do, one and the selfe same impossibilitie will follow, if by the toppe of the triangle be drawen vnto the base a parallel line.
The conuerse of this proposition.