The Elements of Solid Geometry |
From inside the book
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Page 2
... Let AB be a straight line lying in a plane ( 1 ) . Now , we may conceive of the plane as rotating about the line as an axis , and thus occupying successively an indefinite number of positions . But the plane in any position is a plane ...
... Let AB be a straight line lying in a plane ( 1 ) . Now , we may conceive of the plane as rotating about the line as an axis , and thus occupying successively an indefinite number of positions . But the plane in any position is a plane ...
Page 3
... line , all the points of that line must be common to the two planes ( 1 ) ; and no point without this line can be ... Let QP be a perpendicular to the plane MN , drawn from P , a point in the plane ; and let TP be any other line drawn ...
... line , all the points of that line must be common to the two planes ( 1 ) ; and no point without this line can be ... Let QP be a perpendicular to the plane MN , drawn from P , a point in the plane ; and let TP be any other line drawn ...
Page 4
... line at the given point . M B A N Let any line AE be drawn perpendicular to the line AB at a given point A ; and let MN be a plane passing through A , and perpendicular to AB ; then will AE lie in MN . For , if AE does not lie in MN ...
... line at the given point . M B A N Let any line AE be drawn perpendicular to the line AB at a given point A ; and let MN be a plane passing through A , and perpendicular to AB ; then will AE lie in MN . For , if AE does not lie in MN ...
Page 6
... line are parallel to each other . For , from the parallelograms AC ' and AB ' , we derive that , the lines CC ' and ... Let MN and PQ be parallel planes , and let AD be per- pendicular to PQ ; then will AD also be perpendicular to MN ...
... line are parallel to each other . For , from the parallelograms AC ' and AB ' , we derive that , the lines CC ' and ... Let MN and PQ be parallel planes , and let AD be per- pendicular to PQ ; then will AD also be perpendicular to MN ...
Page 7
... Let the line BA be perpendicular to the plane xy ; and let the line DC be parallel to BA ; then will DC be perpen- dicular to xy . In xy , draw through C , any line CF , and parallel to CF draw AE ; then the angles BAE and DCF will be ...
... Let the line BA be perpendicular to the plane xy ; and let the line DC be parallel to BA ; then will DC be perpen- dicular to xy . In xy , draw through C , any line CF , and parallel to CF draw AE ; then the angles BAE and DCF will be ...
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Common terms and phrases
ABC and DEF ABC-B altitude are equal axis base and altitude bases are equal bisecting centre circle circumference coincide common altitude common vertex conical surface COROLLARY cube cuboid DEFINITIONS diameter dicular diedral angle EDC-O equal with respect equivalent faces is called feet Find the volume frustum Hence inscribed prism intersection lateral edges lateral faces lateral surface Let the line line BA lune MN and PQ mutually equal O-ABCD oblique parallelopiped parallel planes parallelogram pass perimeter perpen perpendicular to MN plane angle plane MN plane PQ polar triangle polyedral angle prisms whose bases radii radius regular polyedrons regular polygon right angles right circular cone right prism right section SCHOLIUM sides slant height sphere spherical angle spherical excess spherical polygon spherical triangle straight line tetraedron THEOREM triangles ABC triangular prism triangular pyramids triedral
Popular passages
Page 48 - Assuming that 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...
Page 46 - Similar cylinders are to each other as the cubes of their altitudes, or as the cubes of the diameters of their bases.
Page 4 - If a straight line is perpendicular to each of two other straight lines at their point of intersection, it is perpendicular to the plane of the two lines.
Page 49 - A sphere is a solid bounded by a curved surface, every point of which is equally distant from a point within called the center.
Page 94 - Two triangles are equal if two sides and the included angle of the one are equal respectively to two sides and the included angle of the other (sas = sas). Hyp. In A ABC and A'B'C', AB = A'B', BC = B'C', and Z B = Z B'.
Page 46 - The lateral areas, or the total -areas, of two similar cones of revolution are to each other as the squares of their altitudes...
Page 6 - Theorem: If a straight line is perpendicular to one of two parallel planes, it is perpendicular, also, to the other plane.
Page 9 - ... meeting the plane at unequal distances from the foot of the perpendicular the more remote is the greater.
Page 56 - A spherical angle is measured by the arc of a great circle described from its vertex as a pole, and included between its sides, produced if necessary.