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ABCD adjacent altitude angle BAC angles are equal base bisect called centre chord circle circumference coincide common consequently construct contain Conversely Corollary corresponding Definition describe diagonals diameter difference direction distance divided draw drawn edges equal equally distant expressed exterior extremities faces fall figure follows formed four geometry given point greater hence homologous included indefinite inscribed intersection join less limit line drawn mean measure meet middle point oblique one-half opposite sides parallel parallelogram pass perimeter perpendicular placed plane polygon portion position preceding prism problem produced proportion PROPOSITION quadrilateral quantities radii radius ratio rectangle regular respectively revolving right angles Scholium secant segment sides similar square straight line suppose surface symmetrical tangent theorem third triangle ABC unit vertex vertices
Page 201 - Three lines are in harmonical proportion, when the first is to the third, as the difference between the first and second, is to the difference between the second and third ; and the second is called a harmonic mean between the first and third. The expression 'harmonical proportion...
Page 201 - Words, Facts, and Phrases : A Dictionary of Curious, Quaint, and Out-of-the-Way Matters. By ELIEZER EDWARDS.
Page 122 - Any side of a spherical triangle is less than the sum of the other two.
Page 83 - 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.