The description and use of the universall quadrat.: By which is performed, with great expedition, the whole doctrine of triangles, both plain and sphericall, two severall wayes with ease and exactness. Also the resolution of such propositions as are most usefull in astronomie, navigation, and dialling. By which is also performed the proportioning of lines and superficies: the measuring of all manner of land, board, glasse; timber, stone. &c.
Stirrup, Thomas.
CHAP. LX. Having either all three angles to finde a side, or having two angles and one side, to finde any of the other two sides.
TO finde a side by knowing the three angles, you must first convert the angles into sides by the 42 Chap. which being done, you may by the 56 Chap. finde an angle opposite to any one of these sides; so shall the angle which is thus found, be the side which is here required. As in the said 42 Chap. so likewise having two angles & one side, you may by the said 42 Chap. convert these angles into sides, and the sides into angles; so shall you have two sides and one angle, by which and the 57 or 58 Chapters, you may finde a third side, then having all three sides, you may by the 56 Chap. finde an angle opposite to any of them, which angle thus found, shall be the side required
