The mariners magazine, or, Sturmy's mathematical and practical arts containing the description and use of the scale of scales, it being a mathematical ruler, that resolves most mathematical conclusions, and likewise the making and use of the crostaff, quadrant, and the quadrat, nocturnals, and other most useful instruments for all artists and navigators : the art of navigation, resolved geometrically, instrumentally, and by calculation, and by that late excellent invention of logarithms, in the three principal kinds of sailing : with new tables of the longitude and latitude of the most eminent places ... : together with a discourse of the practick part of navigation ..., a new way of surveying land ..., the art of gauging all sorts of vessels ..., the art of dialling by a gnomical scale ... : whereunto is annexed, an abridgment of the penalties and forfeitures, by acts of parliaments appointed, relating to the customs and navigation : also a compendium of fortification, both geometrically and instrumentally
Sturmy, Samuel, 1633-1669.
Page 24
X. An Obtuse Angle is that which is greater than a Right Angle.
So the Angle CBE is an Obtuse An∣gle, because it is greater than the Angle ABC, which is a Right Angle; For it doth not only contain that Right An∣gle, but the Angle ABE also, and therefore is Obtuse.
[illustration] [geometrical diagram]
