A Treatise on Elementary Geometry: With Appendices Containing a Collection of Exercises for Students and an Introduction to Modern Geomentry |
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Page 183
... faces , and the line AB the edge , of the diedral angle . B E A diedral angle may be named by four letters , one in each face and two on its edge , the two on the edge being written between the other two ; thus , the angle in the figure ...
... faces , and the line AB the edge , of the diedral angle . B E A diedral angle may be named by four letters , one in each face and two on its edge , the two on the edge being written between the other two ; thus , the angle in the figure ...
Page 184
... faces shall coincide . Thus , the diedral angles CABD , C'A'B'D ' , are equal , if , when the edge A'B ' is applied to the edge AB and the face A'F ' to the face AF , the face A'E ' also coincides with the face AE . Since the faces ...
... faces shall coincide . Thus , the diedral angles CABD , C'A'B'D ' , are equal , if , when the edge A'B ' is applied to the edge AB and the face A'F ' to the face AF , the face A'E ' also coincides with the face AE . Since the faces ...
Page 186
... faces respectively parallel , or respectively perpendicular to each other , are either equal or supple mentary . PROPOSITION XVII . - THEOREM . 47. If a straight line is perpendicular to a plane , every plane passed through the line is ...
... faces respectively parallel , or respectively perpendicular to each other , are either equal or supple mentary . PROPOSITION XVII . - THEOREM . 47. If a straight line is perpendicular to a plane , every plane passed through the line is ...
Page 188
... faces of that angle . Let the plane AM bisect the diedral angle CABD ; let P be any point in this plane ; PE and PF the perpendiculars from P upon the planes ABC and ABD ; then , PE PF . = For , through PE and PF pass a plane ...
... faces of that angle . Let the plane AM bisect the diedral angle CABD ; let P be any point in this plane ; PE and PF the perpendiculars from P upon the planes ABC and ABD ; then , PE PF . = For , through PE and PF pass a plane ...
Page 192
... faces ; the angles ASB , BSC , etc. , formed by the edges , are its face angles . A triedral angle is a polyedral angle having but three faces , which is the least number of faces that can form a polyedral angle . 66. Definition . Two ...
... faces ; the angles ASB , BSC , etc. , formed by the edges , are its face angles . A triedral angle is a polyedral angle having but three faces , which is the least number of faces that can form a polyedral angle . 66. Definition . Two ...
Other editions - View all
A Treatise on Elementary Geometry: With Appendices Containing a Collection ... William Chauvenet No preview available - 2016 |
A Treatise on Elementary Geometry: With Appendices Containing a Collection ... William Chauvenet No preview available - 2015 |
Common terms and phrases
ABCD adjacent angles altitude anharmonic ratio apothem base bisects centre of similitude chord circumference circumscribed coincide common cone Corollary cylinder Definition denote diagonals diameter dicular diedral angle distance divided draw edges equally distant equilateral equivalent exterior angle faces figure find the locus frustum given circles given plane given point given straight line hence homologous indefinitely inscribed inscribed angle isosceles Let ABC measure middle point number of sides one-half opposite sides parallelogram parallelopiped pendicular perimeter perpen perpendicular plane MN plane passed polar pole polyedral angle polyedron prism PROPOSITION pyramid quadrilateral radical axis radii radius rectangle regular polygon respectively right angles right triangle Scholium secant segment similar sphere spherical polygon square straight line drawn straight line joining surface symmetrical tangent tetraedron theorem three given triangle ABC triedral vertex vertices volume
Popular passages
Page 19 - The perpendicular is the shortest line that can be drawn from a point to a straight line. Let PC be the perpendicular, and PD any oblique line, from the point P to the line AB. Then PC < PD. For, produce PC to P', making CP
Page 129 - The area of a parallelogram is equal to the product of its base and its height: A = bx h.
Page 46 - The three perpendiculars from the vertices of a triangle to the opposite sides meet in the same point.
Page 115 - It follows from § 259 that if through a fixed point without a circle a secant and a tangent be drawn, the tangent is a mean proportional between the whole secant and its external segment.
Page 117 - The sum of the squares of the sides of any quadrilateral is equal to the sum of the squares of the diagonals plus four times the square of the line joining the middle points of the diagonals.
Page 216 - 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 74 - An angle formed by a tangent and a chord is measured by onehalf the intercepted arc.
Page 107 - If two polygons are composed of the same number of triangles similar each to each and similarly placed, the polygons are similar. Let the polygon AB...
Page 95 - If four quantities are in proportion, they are in proportion by composition, ie the sum of the first two terms is to the second term as the sum of the last two terms is to the fourth term.
Page 255 - A spherical polygon is a portion of the surface of a sphere bounded by three or more arcs of great circles. The bounding arcs are the sides of the polygon ; the...