### Фй лЭне пй чсЮуфет -Уэнфбоз ксйфйкЮт

Ден енфпрЯубме ксйфйкЭт уфйт ухнЮиейт фпрпиеуЯет.

### Ресйечьменб

 GEOMETRY 1 PLANE GEOMETRY 7 POLYGONS IN GENERAL 56 METHODS OF PROVING THEOREMS 64 THE CIRCLE 75 PROPORTION SIMILAR POLYGONS 135 AREAS OF POLYGONS 184 EXERCISES 195
 POLYHEDRAL ANGLES 282 PYRAMIDS 307 GENERAL THEOREMS OF POLYHEDRONS 324 REGULAR POLYHEDRONS 330 EXERCISES 341 THE PRISMATOID FORMULA 354 CONIC SECTIONS 409 TABLE OF FORMULAS 425

 REGULAR POLYGONS AND CIRCLES 211 DEFINITIONS 251 DIHEDRAL ANGLES 269
 INDEX 465 РнехмбфйкЬ дйкбйюмбфб

### ДзмпцйлЮ брпурЬумбфб

УелЯдб 44 - If two triangles have two sides of the one equal, respectively, to two sides of the other, but the included angle of the first greater than the included angle of the second, then the third side of the first is greater than the third side of the second.
УелЯдб 276 - If two planes are perpendicular to each other, a straight line drawn in one of them perpendicular to their intersection is perpendicular to the other plane.
УелЯдб 52 - If the opposite sides of a quadrilateral are equal, the figure is a parallelogram.
УелЯдб 43 - If two angles of a triangle are unequal, the sides opposite are unequal, and the greater side is opposite the greater angle.
УелЯдб 193 - The areas of two triangles which have 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. To prove that Proof. A Let the triangles ABC and ADE have the common angle A. A ABC -AB X AC Now and A ADE AD X AE Draw BE.
УелЯдб 362 - A sphere is a solid bounded by a surface all points of which are equally distant from a point within called the centre.
УелЯдб 171 - In any triangle the product of two sides is equal to the product of the diameter of the circumscribed circle by the altitude upon the third side.
УелЯдб 73 - The sum of the perpendiculars dropped from any point within an equilateral triangle to the three sides is constant, and equal to the altitude.
УелЯдб 385 - Hence the two last are right angles ; hence the arc drawn from the vertex of an isosceles spherical triangle to the middle of the base, is at right angles to the base, and bisects the vertical angle.
УелЯдб 77 - 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.