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A A B C ABCD altitude arc A B axis bisect centre circle circumference circumscribed coincide conical surface Corollary cylinder denote diagonals diameter dihedral angle distance divided Draw equal respectively equally distant equiangular polygon equilateral equivalent figure frustum Geometry given point greater Hence homologous sides hypotenuse intersection isosceles lateral edges lateral faces Let A B line A B measured middle point mutually equiangular number of sides parallel parallelogram parallelopiped perimeter perpendicular plane MN prove pyramid Q. E. D. Proposition quadrilateral radii radius equal ratio rectangles regular polygon right angles right triangle Scholium segment sides of equal similar polygons slant height sphere spherical angle spherical polygon spherical triangle square subtend surface symmetrical tangent tetrahedron Theorem third side trihedral vertex vertices volume
Side 132 - To describe an isosceles triangle having each of the angles at the base double of the third angle.
Side 208 - In any proportion, the product of the means is equal to the product of the extremes.
Side 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.
Side 355 - A sphere is a solid bounded by a surface all points of which are equally distant from a point within called the centre.
Side 181 - Any two rectangles are to each other as the products of their bases by their altitudes.
Side 194 - 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.
Side 152 - 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'.