### Contents

 INTRODUCTION 9 Sec V 18 Sec VI 26 Of Polygons in General 35 Sec IX 49
 BOOK II 55 Of Circles 68 SUPPLEMENT 97 26 101

### Popular passages

Page 69 - If from a point without a circle, a tangent and a secant be drawn, the tangent will be a mean proportional between the secant and its external segment.
Page 42 - The circumference of every circle is supposed to' be divided into 360 equal parts, called degrees ; each degree into 60 minutes, and each minute into 60 seconds. Degrees, minutes, and seconds are designated by the characters �, ', ". Thus 23� 14' 35" is read 23 degrees, 14 minutes, and 35 seconds.
Page 21 - If two triangles have two sides, and the included angle of the one equal to two sides and the included angle of the other, each to each, the two triangles are equal in all respects.
Page 47 - It follows, then, that the area of a circle is equal to half the product of its circumference and its radius.
Page 72 - The areas of two circles are to each other as the squares of their radii. For, if S and S' denote the areas, and R and R
Page 33 - The square described on the hypothenuse of a right-angled triangle is equivalent to the sum of the squares described on the other two sides.
Page 38 - The area of a regular polygon is equal to half the product of its apothem and perimeter.
Page 52 - PROBLEM VII. Two angles of a triangle being given, to find the third angle. The three angles of every triangle are together equal to two right angles (Prop.
Page 30 - The area of a rectangle is equal to the product of its base and altitude.
Page 69 - If two triangles have two angles of the one equal to two angles of the other, each to each, and one side equal to one side, viz. either the sides adjacent to the equal...