### тИ КщМЕ ОИ ВЯчСТЕР -сЩМТАНГ ЙЯИТИЙчР

дЕМ ЕМТОПъСАЛЕ ЙЯИТИЙщР СТИР СУМчХЕИР ТОПОХЕСъЕР.

### пЕЯИЕВЭЛЕМА

 Preliminary Definitions 1 Definitions and General Principles 17 THE CIRCLE 46 On Measurement 56 Problems in Construction 65 Ratio AND PROPORTION SIMILAR FIGURES 78 Proportional Lines 84 PAGE 100
 REGULAR POLYGONS AND CIRCLES 124 Definitions 139 SOLID GEOMETRY 145 Diedral Angles 155 POLYEDRONS CYLINDERS AND COnes 164 THE SPHERE 192 Formulæ 209 пМЕУЛАТИЙэ ДИЙАИЧЛАТА

### дГЛОЖИКч АПОСПэСЛАТА

сЕКъДА 46 - PERIPHERY of a circle is its entire bounding line ; or it is a curved line, all points of which are equally distant from a point within called the centre.
сЕКъДА 105 - ... any two parallelograms are to each other as the products of their bases by their altitudes. PROPOSITION V. THEOREM. 403. The area of a triangle is equal to half the product of its base by its altitude.
сЕКъДА 82 - If any number of quantities are proportional, any antecedent is to its consequent as the sum of all the antecedents is to the sum of all the consequents. Let a : b = c : d = e :f Now ab = ab (1) and by Theorem I.
сЕКъДА 192 - A sphere is a solid bounded by a surface all points of which are equally distant from a point within called the centre.
сЕКъДА 108 - Two triangles having an angle of the one equal to an angle of the other are to each other as the products of the sides including the equal angles.
сЕКъДА 146 - A STRAIGHT line is perpendicular to a plane, when it is perpendicular to every straight line which it meets in that plane.
сЕКъДА 30 - In an isosceles triangle, the angles opposite the equal sides are equal.
сЕКъДА 80 - In any proportion the terms are in proportion by Composition ; that is, the sum of the first two terms is to the first term as the sum of the last two terms is to the third term.
сЕКъДА 79 - If the product of two quantities is equal to the product of two others, one pair may be made the extremes, and the other pair the means, of a proportion. Let ad = ос.
сЕКъДА 148 - Equal oblique lines from a point to a plane meet the plane at equal distances from the foot of the perpendicular ; and of two unequal oblique lines the greater meets the plane at the greater distance from the foot of the perpendicular.