A Text-book of Geometry

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Ginn, 1895 - 437 страница
 

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Страница 96 - Any two sides of a triangle are together greater than the third side.
Страница 270 - The acute angle which a straight line makes with its projection upon a plane is the least angle which it makes with any line of the plane.
Страница 187 - Two triangles having 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.
Страница 64 - 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 46 INTERCEPTS BY PARALLEL LINES.
Страница 141 - Sines that the bisector of an angle of a triangle divides the opposite side into parts proportional to the adjacent sides.
Страница 134 - If four quantities are in proportion, they are in proportion by composition; that is, the sum of the first two terms is to the second term as the sum of the last two terms is to the fourth term.
Страница 304 - The frustum of a triangular pyramid is equivalent to the sum of three pyramids whose common altitude is the altitude of the frustum and whose bases are the lower base, the upper base, and a mean proportional between the two bases of the frustum.
Страница 352 - A spherical polygon is a portion of the surface of a sphere bounded by three or more arcs of great circles. The bounding arcs are the sides of the polygon ; the...
Страница 403 - Show that the locus of a point which moves so that the sum of its distances from two h'xed straight lines is constant is a straight line.
Страница 132 - If the product of two quantities is equal to the product of two others, either two may be made the extremes of a proportion and the other two the means.

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