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acute altitude axis base bisect called centre chord circle circumference coincide common cone construct Corollary cylinder denote describe diagonals diameter difference dihedral angle direction distance divided draw edges equal equal respectively equally distant equilateral equivalent extremities faces fall figure formed four frustum given greater Hence homologous sides included inscribed intersection joining lateral less limit line drawn measured meet oblique opposite parallel pass perimeter perpendicular plane polygon polyhedrons prism Problem proportional Proposition prove pyramid Q. E. D. Proposition radii radius ratio regular polygon respectively right angles segment Show similar sphere square straight line surface symmetrical Take tangent Theorem third triangle trihedral vertex vertices volume
Sivu 40 - If two triangles have two angles of the one equal to two angles of the other, each to each, and one side equal to one side, viz.
Sivu 175 - Any two rectangles are to each other as the products of their bases by their altitudes.
Sivu 38 - Any side of a triangle is less than the sum of the other two sides.
Sivu 349 - A sphere is a solid bounded by a surface all points of which are equally distant from a point within called the centre.
Sivu 83 - A straight line perpendicular to a radius at its extremity is a tangent to the circle. Let MB be perpendicular to the radius OA at A.
Sivu 207 - To construct a parallelogram equivalent to a given square, and having the difference of its base and altitude equal to a given line.
Sivu 188 - In any triangle, the square of the side opposite an acute angle is equal to the sum of the squares of the other two sides diminished by twice the product of one of those sides and the projection of the other upon that side.
Sivu 146 - The areas of two triangles which have 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. A D A' Hyp. In triangles ABC and A'B'C', To prove AABC A A'B'C' A'B' x A'C ' Proof. Draw the altitudes BD and B'D'.