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ABCD adjacent altitude angles are equal base bisects Book called centre chord circle circumference circumscribed coincide common cone consequently construct contained Corollary cylinder Definition describe diagonal diameter diedral angle difference distance divided draw drawn equal equally distant equivalent Exercise extremities faces fall figure follows formed four frustum given line given point given straight line greater half Hence included angle increased indefinitely inscribed intersection isosceles joining length less limit locus mean measure meet middle point number of sides one-half opposite parallel parallelogram parallelopiped pass perimeter perpendicular placed plane pole polyedron polygon prism problem proportional Proposition VII prove pyramid quantities radii radius ratio rectangle regular polygon right angles Scholium segment sides similar sphere spherical square Suggestion surface tangent theorem third tion triangle triangle ABC unit vertex vertices volume
Page 131 - The area of a rectangle is equal to the product of its base and altitude.
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.