Elementary Geometry

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J.B. Lippincott Company, 1893
 

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Page 131 - The area of a rectangle is equal to the product of its base and altitude.
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.
Page 135 - 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 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 282 - A lune is to the, surface of the sphere as the angle of the lune is to four right angles. Let...
Page 115 - 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 52 - The three perpendiculars from the vertices of a triangle to the opposite sides meet in the same point.
Page 61 - A tangent to a circle is perpendicular to the radius drawn to the point of contact.
Page 38 - The sum of the three angles of any triangle is equal to two right angles.

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