### Popular passages

Page 137 - 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.
Page 133 - The area of a rectangle is equal to the product of its base and altitude.
Page 228 - The lateral area of a prism is equal to the product of the perimeter of a right section of the prism, by a lateral edge. Let AD...
Page 249 - A truncated triangular prism, is equivalent to the sum of three pyramids whose common base is the base of the prism, and whose vertices are the three vertices of the inclined section.
Page 117 - The square of the length of the hypotenuse of a right triangle is equal to the sum of the squares of the lengths of the other two sides.
Page 278 - Each side of a spherical triangle is less than the sum of the other two sides.
Page 113 - If two polygons are composed of the same number of triangles, similar each to each and similarly placed, the polygons are similar.
Page 52 - 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.
Page 268 - Any line or plane tangent to a sphere is perpendicular to the radius drawn to the point of contact.
Page 200 - If a straight line is perpendicular to each of two straight lines at their point of intersection, it is perpendicular to the plane of those lines.