### Фй лЭне пй чсЮуфет -Уэнфбоз ксйфйкЮт

Ден енфпрЯубме ксйфйкЭт уфйт ухнЮиейт фпрпиеуЯет.

### Ресйечьменб

 LINES AND PLANES IN SPACE 1 PYRAMIDS 77 GENERAL POLYHEDRONS 91 SUPPLEMENT 137 PAGE 160 INCOMMENSURABLE CASE OF 108 169 POLYHEDRONS 171
 SPHERICAL TRIANGLES 183 PRACTICAL MENSURATION 191 RECREATIONS 223 HISTORY OF GEOMETRY 227 IMPORTANT FORMULAS 233 INDEX 235 РнехмбфйкЬ дйкбйюмбфб

### ДзмпцйлЮ брпурЬумбфб

УелЯдб 7 - The line joining the midpoints of two sides of a triangle is parallel to the third side and equal to one-half of it.
УелЯдб 40 - A line which joins the midpoints of two sides of a triangle is parallel to the third side and equal to half of it.
УелЯдб 176 - 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.
УелЯдб 10 - 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. Given A ABC and A'B'C...
УелЯдб 15 - In any triangle, the square of the side opposite an acute angle is equal to the sum of the squares of the other two sides diminished by twice the product of one of those sides and the projection of the other upon that side.
УелЯдб 77 - The height of a cone is the perpendicular distance from the vertex to the plane of the base.
УелЯдб 3 - If the first of three quantities is greater than the second, and the second is greater than the third, then the first is greater than the third.
УелЯдб 24 - If a straight line is perpendicular to each of two other straight lines at their point of intersection, it is perpendicular to the plane of the two lines.
УелЯдб 16 - If two chords intersect in a circle, the product of the segments of one is equal to the product of the segments of the other.
УелЯдб 15 - The sum of the squares of two sides of a triangle is equal to twice the square of half the third side increased by twice the square of the median upon that side.