Elements of Synthetic Solid Geometry |
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Page 26
... opposite sides of a skew quadrilateral bisect one another . ABCD is a skew quadrilateral , AB and BC lying in a plane different from the plane of CD and DA . AC and BD are the diagonals . E , F , G , H are middle points 26 SOLID OR ...
... opposite sides of a skew quadrilateral bisect one another . ABCD is a skew quadrilateral , AB and BC lying in a plane different from the plane of CD and DA . AC and BD are the diagonals . E , F , G , H are middle points 26 SOLID OR ...
Page 27
... opposite sides are FH and IJ . Therefore FH and IJ bisect one another ; and hence FH , IJ , and EG mutually bisect each other . Cor . 2. A , B , C , D are four points in space , and AB , AC , AD , BC , BD , and CD are their six ...
... opposite sides are FH and IJ . Therefore FH and IJ bisect one another ; and hence FH , IJ , and EG mutually bisect each other . Cor . 2. A , B , C , D are four points in space , and AB , AC , AD , BC , BD , and CD are their six ...
Page 33
... opposite directions , or we can have eight variations of sign in all . But four of these are the other four reversed . Therefore three lines forming a sheaf have four iso- clinal lines and four isoclinal planes through the centre . 37 ...
... opposite directions , or we can have eight variations of sign in all . But four of these are the other four reversed . Therefore three lines forming a sheaf have four iso- clinal lines and four isoclinal planes through the centre . 37 ...
Page 35
... opposite sides of the plane , or if O and O ' be upon the same side of the plane while the triangles are not superposable until one of them is turned over in the plane , then the two corners , although having correspond- ing parts ...
... opposite sides of the plane , or if O and O ' be upon the same side of the plane while the triangles are not superposable until one of them is turned over in the plane , then the two corners , although having correspond- ing parts ...
Page 36
... opposite face angles , 1. The greater face angle is opposite the greater dihedral angle ; 2. The greater dihedral angle is opposite the greater face angle . O. LMN is a three - faced cor- ner having O as vertex , and L , M , N as edges ...
... opposite face angles , 1. The greater face angle is opposite the greater dihedral angle ; 2. The greater dihedral angle is opposite the greater face angle . O. LMN is a three - faced cor- ner having O as vertex , and L , M , N as edges ...
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Common terms and phrases
AB² altitude axis base bisect bisector centroid chord circle circular cone common line complanar congruent conic cos² cube cuboid curve cylinder cylindroid denote diagonals diameter dihedral angles draw ellipse equal face angles form a sheaf four frustum given line given point Hence hyperbola infinity intersection isoclinal line join line-segment locus mean centre median meet middle point mon line non-complanar lines normal number of faces octahedron opposite parabola parallel lines parallelepiped parallelogram pass perpendicular planar line plane figure plane geometry point equidistant polygon polyhedra polyhedron prism prismatoid projection Proof pyramid radius rectangle regular tetrahedron right angle right section right-bisector plane secant line segment sheaf of lines sides skew quadrilateral spatial figure spheric geometry spheric line spheric triangle squares surface tangent line Theorem three-faced corner vertex vertices volume
Popular passages
Page 236 - To the many of my fellow-teachers in America who have questioned me in regard to the Non-Euclidean Geometry, I would now wish to say publicly that Dr. Smith's conception of that profound advance in pure science is entirely sound. . . . Dr. Smith has given us a book of which our country can be proud. I think it the duty of every teacher of geometry to examine it carefully."— From Prof.
Page 237 - OF EUCLID'S ELEMENTS. Including Alternative Proofs, together with additional Theorems and Exercises, classified and arranged. By HS HALL, MA, and FH STEVENS, MA, Masters of the Military and Engineering Side, Clifton College. Gl.
Page 67 - The square described on the hypothenuse of a rightangled triangle is equal to the sum of the squares described on the other two sides.
Page 1 - The projection of a line on a plane is the locus of the projections of all its points.
Page 234 - ... University of Ohio, of Pennsylvania, of Michigan, of Wisconsin, of Kansas, of California, of Missouri, Stanford University, etc., etc. "Those acquainted with Mr. Smith's text-books on conic sections and solid geometry will form a high expectation of this work, and we do not think they will be disappointed. Its style is clear and neat, it gives alternative proofs of most of the fundamental theorems, and abounds in practical hints, among which we may notice those on the resolution of expressions...
Page 238 - AND BESSEL'S FUNCTIONS. Crown 8vo. IQJ. 6d. WILSON (JM)— ELEMENTARY GEOMETRY. Books I. to V. Containing the Subjects of Euclid's first Six Books. Following the Syllabus of the Geometrical Association. By JM WILSON, MA, Head Master of Clifton College. New Edition. Extra fcap. 8vo. 4*.
Page 237 - RICHARDSON.— THE PROGRESSIVE EUCLID. Books I. and II. With Notes, Exercises, and Deductions. Edited by AT RICHARDSON, MA, Senior Mathematical Master at the Isle of Wight College.
Page 97 - S'-A'B'C' be two triangular pyramids having equivalent bases situated in the same plane, and equal altitudes. To prove that S-ABC =c= S'-A'B'C'. Proof. Divide the altitude into n equal parts, and through the points of division pass planes parallel to the plane of the bases, forming the sections DEF, GHI, etc., D'E'F', G'H'I', etc. In the pyramids S-ABC and S'-A'B'C' inscribe prisms whose upper bases are the sections DEF, GHI, etc., D'E'F', G'H'I', etc.
Page 234 - GEOMETRY. 12mo. $2.60. WORKS BY ISAAC TODHUNTER, FRS Late Principal Lecturer on Mathematics in St. John's College. PLANE CO-ORDINATE GEOMETRY, As Applied to the Straight Line and the Conic Sections.