For if three angles be equall to two right angles, then
are two lesser than two right angles.
And
15. The one side of any triangle being continued or drawne out, the outter angle shall be equal to the two inner opposite angles.
This is the rate of the inner angles in one and the same triangle: The rate of the outter with the inner opposite angles doth followe. As in the triangle aei, let the side ei, be continued or drawne out unto o; the two angles on each side aio and aie, are by the [14 e v]. equall to two right angles: and the three inner angles, are by the [13. e.] equall also to two right angles; take away aie, the common angle, and the outter angle aio, shall be left equall to the other two inner and opposite angles.
Therefore
16. The said outter angle is greater than either of the inner opposite angles. 16. p j.
This is a consectary following necessarily upon the next former consectary.
