### Фй лЭне пй чсЮуфет -Уэнфбоз ксйфйкЮт

Ден енфпрЯубме ксйфйкЭт уфйт ухнЮиейт фпрпиеуЯет.

### Ресйечьменб

 INTRODUCTORY DEFINITIONS 1 RATIO AND PROPORTION 25 BOOK II 31
 BOOK IV 64 BOOK VI 89

### ДзмпцйлЮ брпурЬумбфб

УелЯдб 30 - Hence -,- = -76" dn that is a" : b" = c" : dn THEOREM IX. 23 1 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...
УелЯдб 49 - A circle is a plane figure bounded by a curved line, called the circumference, every point of which is equally distant from a point within called the center.
УелЯдб 96 - Upon a given straight line to describe a segment of a circle, which shall contain an angle equal to a given rectilineal angle.
УелЯдб 12 - In an isosceles triangle the angles opposite the equal sides are equal.
УелЯдб 11 - 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.
УелЯдб 23 - If two triangles have two sides of one respectively equal to two sides of the other, and the angles contained by those sides supplementary, the triangles are equal in area.
УелЯдб 20 - ... polygon, is equal to twice as many right angles as the polygon has sides minus two.
УелЯдб 71 - The convex surface of a right prism is equal to the perimeter of its base multiplied by its altitude.
УелЯдб 40 - At a point 200 feet from, and on a level with the base of a tower, the angle of elevation of the top of the tower is observed to be 60° : what is the height of the tower?
УелЯдб 23 - In every plane triangle, the sum of two sides is to their difference as the tangent of half the sum of the angles opposite those sides is to the tangent of half their difference.