# Marks' First Lessons in Geometry: In Two Parts, Objectively Presented and Designed for the Use of Primary Classes in Grammar Schools, Academies, Etc

Ivison, Phinney, Blakeman, & Company, 1869 - 157 СЕКъДЕР

### тИ КщМЕ ОИ ВЯчСТЕР -сЩМТАНГ ЙЯИТИЙчР

дЕМ ЕМТОПъСАЛЕ ЙЯИТИЙщР СТИР СУМчХЕИР ТОПОХЕСъЕР.

### дГЛОЖИКч АПОСПэСЛАТА

сЕКъДА 124 - America, but know that we are alive, that two and two make four, and that the sum of any two sides of a triangle is greater than the third side.
сЕКъДА 24 - An ACUTE ANGLE is one which is less than a right angle ; as the angle DEF.
сЕКъДА 148 - 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 152 - We wish to prove that The angle formed by a tangent and a chord meeting at the point of contact is measured by half the intercepted arc. Let the tangent CAB and the chord AD meet at the point of contact A ; then will the angle BAD be measured by half the intercepted arc A D.
сЕКъДА 74 - 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 center.
сЕКъДА 147 - If two triangles have the three sides of the one equal to the three sides of the other, each to each, the triangles are congruent.
сЕКъДА 3 - The elements of Geometry are much easier to learn, and are of more value when learned, than advanced Arithmetic; and, if a boy is to leave school with merely a grammar-school education, he would be better prepared for the active duties of life with a little Arithmetic and some Geometry, than with more Arithmetic and no Geometry.