ERRAT A. 93. Page 18. line 24. from the foot, omitted (margin) a 5.1, 3. from the top, for AC is read AG is 136. 12. from the foot, for tirangle read triangle 196. 15. from the foot, for ; read : 196. 13. from the foot, for HBC. And read HBC, and 233 31. from the top, for propofitions, read propofition, 235. - 14. from the foot, for fides read fide 237 2. from the top, for any angle read an angle 237. 27. from the top, for DGE read DGF 241. 25. from the foot, for of P.4. read by P. 4. 242. 22. from the foot, for a circle read the circle 247. 12. from the top, for ET. (margin) read P.T. 266. 11. from the top, for AE read AF 277. 16.& 43. from the top, for Proctus read Proclus 299. 17. from the top, for altogether. read all together. 326. 4. from the foot, for 32d read 2. Cor. 15. Besides these, in the 4th line of the Note to PROB. IX. in p. 320. there is ADE, instead of ADB, and Pl. I. Fig. 16. is omitted in the margin opposite to PROB. X.; and in p. 325. in the first line of the last column of the Table, there is 13, instead of 18. a A Point has situation, but not magnitude. See Notes II. A line is length without breadth. III. IV. points. a A superficies is that which hath only length and breadth. VI. VII. VIII. Omitted. IX. to one another, which meet together, but are not in the same B N. B. : 6 · N. B. When several angles are at one point B, any one of them is expreffed by three letters, of which the letter that • is at the vertex of the angle, that is, at the point in which • the straight lines that contain the angle meet one another, is put between the other two letters, and one of these two is * somewhere upon one of those straight lines, and the other upon the other line: Thus, the angle which is contained by . the straight lines AB, CB is named the angle ABC, or CB.1; " that which is contained by AB, DB is named the angle ABD, or DBA ; and that which is contained by DB, CB is called • the angle DBC, or CBD; but, if there be only one angle at a point, it may be expressed by a letter placed at that point ; X. ther straight line makes the adjacent XI. IL XII. XIII. Omitted. XIV. XV. Book. T. XV. one line, which is called the cir- ther: XVI. Definition A. XVII. A diameter of a circle is a straight line drawn through the centre, and terminated both ways by the circumference. XVIII. A semicircle is the figure contained by a diameter and the part of the circumference cut off by the diameter. XIX. Omitted. XX. XXI. XXII. XXIII. Multilateral figures, or polygons, by more than four straight lines. XXIV, XXV. A A A XXVI. B 2 XXVII. Воок І. XXVII. XXVIII AAA ^ XXIX. XXX. equal, and all its angles right angles. XXXI. XXXII. are not right angles. XXXIII. another, but all its fides are not equal, nor its angles right XXXIV. Xxxv. the same plane, and which, being produced ever so far both ways, do not meet. PO. |