### тИ КщМЕ ОИ ВЯчСТЕР -сЩМТАНГ ЙЯИТИЙчР

дЕМ ЕМТОПъСАЛЕ ЙЯИТИЙщР СТИР СУМчХЕИР ТОПОХЕСъЕР.

### дГЛОЖИКч АПОСПэСЛАТА

сЕКъДА 83 - A cos 6 = cos a cos c + sin a sin c cos B cos c = cos a cos 6 + sin a sin 6 cos C Law of Cosines for Angles cos A = — cos B...
сЕКъДА 28 - 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 will be equal in all their parts." Axiom 1. "Things which are equal to the same thing, are equal to each other.
сЕКъДА 104 - The square described on the hypothenuse of a rightangled triangle is equal to the sum of the squares described on the other two sides.
сЕКъДА 90 - To inscribe a circle in a given triangle. Let ABC be the given triangle. Bisect the angles A and B by the lines AO and BO, meeting at the point 0.
сЕКъДА 2 - The logarithm of any power of a number is equal to the logarithm of the number multiplied by the exponent of the power.
сЕКъДА 56 - ABM'" ; that is, the functions of — a are the same as the functions of 360╟ — a. From an inspection of the figure, we shall discover the following relations, viz. : sin (— a) = — sin a ; cos (— a) = cos a ; tan (—a) = — tan a ; cot (— a) = — cot a ; sec ( - a) = sec a ; cosec ( — a) = — cosec a.
сЕКъДА 243 - AD c, have two sides, and the included angle of the one equal to two sides and the included angle of the other, each \ to each, and are equal in all their parts...
сЕКъДА 154 - Similar arcs are to each other as their radii; and similar sectors are to each other as the squares of their radii.
сЕКъДА 57 - In a series of equal ratios, the sum of the antecedents is to the sum of the consequents as any antecedent is to its consequent.
сЕКъДА 16 - A DIAGONAL of a polygon is a line joining the vertices of two angles, not consecutive.