### тИ КщМЕ ОИ ВЯчСТЕР -сЩМТАНГ ЙЯИТИЙчР

дЕМ ЕМТОПъСАЛЕ ЙЯИТИЙщР СТИР СУМчХЕИР ТОПОХЕСъЕР.

### дГЛОЖИКч АПОСПэСЛАТА

сЕКъДА 50 - Two parallelograms are congruent if two sides and the included angle of one are equal, respectively, to two sides and the included angle of the other.
сЕКъДА 166 - S' denote the areas of two ╘ whose radii are R and R', and diameters D and D', respectively. Then, | = "* ╖ = ёё = ё• <╖337> That is, the areas of two circles are to each other as the squares of their radii, or as the squares of their diameters.
сЕКъДА 136 - ... any two parallelograms are to each other as the products of their bases by their altitudes. PROPOSITION V. THEOREM. 403. The area of a triangle is equal to half the product of its base by its altitude.
сЕКъДА 17 - In an isosceles triangle the angles opposite the equal sides are equal.
сЕКъДА 124 - If, from a point without a circle, two secants are drawn, the product of one secant and its external segment is equal to the product of the other and its external segment.
сЕКъДА 39 - If two angles of a triangle are equal, the sides opposite are equal.
сЕКъДА 44 - If two triangles have two sides of 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.
сЕКъДА 58 - The straight line joining the middle points of two sides of a triangle is parallel to the third side, and equal to half of it.
сЕКъДА 6 - C as a centre, and with a radius sufficiently great, describe an arc cutting the line AB in two points, A and B ; then, from...
сЕКъДА 33 - That is, if two parallels are cut by a transversal, the sum of the interior angles on the same side of the transversal is equal to two right angles.