Elements of Plane and Solid GeometryGinn, Heath, 1877 - 398 σελίδες |
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Σελίδα 3
... edge is applied to any one of them , the straight - edge in every part will touch the surface , the surfaces are called Plane Surfaces . The sharp edge in which any two of these surfaces meet is called a Line . The place at which any ...
... edge is applied to any one of them , the straight - edge in every part will touch the surface , the surfaces are called Plane Surfaces . The sharp edge in which any two of these surfaces meet is called a Line . The place at which any ...
Σελίδα 268
... edge at the same point . Thus , in the diagram , C - A B - D is a dihedral an- gle , CB and DA are its faces , AB is its edge , OPH is its plane angle if OP and HP in the faces be H D perpendicular to the edge A B at the same point P ...
... edge at the same point . Thus , in the diagram , C - A B - D is a dihedral an- gle , CB and DA are its faces , AB is its edge , OPH is its plane angle if OP and HP in the faces be H D perpendicular to the edge A B at the same point P ...
Σελίδα 269
... edges . 5. Two dihedral angles are supplements of each other if two of their faces be parallel and lie in the same direction , and the other faces be parallel and lie in the opposite direction , from the edges . PROPOSITION XVI ...
... edges . 5. Two dihedral angles are supplements of each other if two of their faces be parallel and lie in the same direction , and the other faces be parallel and lie in the opposite direction , from the edges . PROPOSITION XVI ...
Σελίδα 277
... edges . The portions of the planes A bounded by the edges are its faces . B E The plane angles ASB , BSC , etc. , formed by the edges are its face angles . 481. DEF . Polyhedral angles are classified as trihedral , quad- rahedral , etc ...
... edges . The portions of the planes A bounded by the edges are its faces . B E The plane angles ASB , BSC , etc. , formed by the edges are its face angles . 481. DEF . Polyhedral angles are classified as trihedral , quad- rahedral , etc ...
Σελίδα 283
... edges of a tri- hedral angle and the bisectors of the opposite face angles re- spectively intersect in the same straight line . 8. Find the locus of the points which are equally distant from the three edges of a trihedral angle . 9. Cut ...
... edges of a tri- hedral angle and the bisectors of the opposite face angles re- spectively intersect in the same straight line . 8. Find the locus of the points which are equally distant from the three edges of a trihedral angle . 9. Cut ...
Άλλες εκδόσεις - Προβολή όλων
Συχνά εμφανιζόμενοι όροι και φράσεις
A B C D AABC ABCD altitude apothem arcs A B axis base and altitude centre centre of symmetry chord circumference circumscribed coincide conical surface COROLLARY cylinder denote diagonals diameter dihedral angle distance divided draw equal respectively equally distant equilateral equivalent frustum given point Hence homologous sides hypotenuse intersection isosceles lateral area lateral edges lateral faces Let A B Let ABC line A B measured by arc middle point number of sides opposite parallel lines parallelogram parallelopiped perimeter perpendicular plane MN polyhedral angle prove Q. E. D. PROPOSITION radii ratio rect rectangles regular inscribed regular polygon right angles right section SCHOLIUM similar polygons slant height sphere spherical angle spherical polygon spherical triangle straight line drawn surface tangent tetrahedron THEOREM trihedral upper base vertex vertices volume
Δημοφιλή αποσπάσματα
Σελίδα 188 - Two triangles having 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.
Σελίδα 347 - A sphere is a solid bounded by a surface all points of which are equally distant from a point within called the centre.
Σελίδα 134 - In a series of equal ratios, the sum of the antecedents is to the sum of the consequents as any antecedent is to its consequent.
Σελίδα 201 - To construct a parallelogram equivalent to a given square, and having the sum of its base and altitude equal to a given line.
Σελίδα 221 - The area of a regular inscribed hexagon is a mean proportional between the areas of the inscribed and circumscribed equilateral triangles.
Σελίδα 217 - The area of a regular polygon is equal to onehalf the product of its apothem and perimeter.
Σελίδα 44 - Two triangles are equal if the three sides of the one are equal, respectively, to the three sides of the other. In the triangles ABC and A'B'C', let AB be equal to A'B', AC to A'C', BC to B'C'. To prove that A ABC = A A'B'C'.
Σελίδα 186 - 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.
Σελίδα 346 - A frustum of any pyramid is equivalent to the sum of three pyramids whose common altitude is the altitude of the frustum, and whose bases are the lower base, the upper base, and a mean proportional between the bases, of the frustum. For, let ABCDE-F be a frustum of any pyramid S-ABCDE. Let S'-A'B'C' be a triangular pyramid, having the same altitude as the pyramid S-ABCDE, and a base A'B'C' equivalent to the base ABCDE, and in the same plane with it.
Σελίδα 95 - BAC, inscribed in a segment greater than a semicircle, is an acute angle ; for it is measured by half of the arc BOC, less than a semicircumference.