The Essentials of GeometryD.C. Heath & Company, 1899 - 395 σελίδες |
Αναζήτηση στο βιβλίο
Αποτελέσματα 1 - 5 από τα 73.
Σελίδα 7
... Hence , a perpendicular can be drawn to AB at C , and but one . 26. Cor . All right angles are equal . Let ABC and DEF be right angles . To prove angles ABC and DEF equal . A B D E Let angle ABC be superposed ( i.e. , placed ) upon ...
... Hence , a perpendicular can be drawn to AB at C , and but one . 26. Cor . All right angles are equal . Let ABC and DEF be right angles . To prove angles ABC and DEF equal . A B D E Let angle ABC be superposed ( i.e. , placed ) upon ...
Σελίδα 9
... Hence , the sum of angles ACD and BCD is equal to two right angles . 33. Sch . Since angles ACD and BCD are supplementary ( § 30 ) , the theorem may be stated as follows : If two adjacent angles have their exterior sides in the same ...
... Hence , the sum of angles ACD and BCD is equal to two right angles . 33. Sch . Since angles ACD and BCD are supplementary ( § 30 ) , the theorem may be stated as follows : If two adjacent angles have their exterior sides in the same ...
Σελίδα 11
... Hence , EC coincides with BC , and AC and BC lie in the same str . line . 38. Sch . I. It will be observed that the enunciation of every theorem consists essentially of two parts ; the Hypoth- esis , and the Conclusion . Thus , we may ...
... Hence , EC coincides with BC , and AC and BC lie in the same str . line . 38. Sch . I. It will be observed that the enunciation of every theorem consists essentially of two parts ; the Hypoth- esis , and the Conclusion . Thus , we may ...
Σελίδα 15
... cons . , CDC " is a str . line . [ But one str . line can be drawn between two points . ] Hence , CE cannot be L AB , and CD is the only can be drawn . PROP . VII . THEOREM . 46. The perpendicular is RECTILINEAR FIGURES . 15.
... cons . , CDC " is a str . line . [ But one str . line can be drawn between two points . ] Hence , CE cannot be L AB , and CD is the only can be drawn . PROP . VII . THEOREM . 46. The perpendicular is RECTILINEAR FIGURES . 15.
Σελίδα 20
... Hence , DE cannot be > DF . ( § 49 ) In like manner , if we suppose DE < DF , CE would be < CF , which is contrary to the hypothesis that CE = CF. Hence , DE cannot be < DF . Then , if DE can be neither > DF , nor < DF , we must have DE ...
... Hence , DE cannot be > DF . ( § 49 ) In like manner , if we suppose DE < DF , CE would be < CF , which is contrary to the hypothesis that CE = CF. Hence , DE cannot be < DF . Then , if DE can be neither > DF , nor < DF , we must have DE ...
Άλλες εκδόσεις - Προβολή όλων
Συχνά εμφανιζόμενοι όροι και φράσεις
AB² ABCD AC² adjacent angles altitude apothem approach the limit area ABC axis base and altitude BC² bisector bisects centre chord circle circumference circumscribed coincide cone of revolution Converse of Prop diagonals diameter diedral angle distance Draw line equally distant equilateral equivalent exterior angle faces Find the area frustum Given line given point Hence homologous homologous sides hypotenuse intersecting isosceles triangle lateral area lateral edges line drawn line joining middle point number of sides parallel parallelogram parallelopiped perimeter perpendicular plane MN polyedral polyedron prism pyramid quadrilateral radii radius rectangle regular inscribed regular polygon rhombus right angles right triangle segment side BC similar slant height spherical polygon spherical triangle square tangent tetraedron THEOREM trapezoid triangle ABC triangular prism triedral vertex vertices volume Whence
Δημοφιλή αποσπάσματα
Σελίδα 371 - A zone is a portion of the surface of a sphere included between two parallel planes.
Σελίδα 49 - ... the three sides of one are equal, respectively, to the three sides of the other. 2. Two right triangles are congruent if...
Σελίδα 261 - The projection of a point on a plane is the foot of the perpendicular drawn from the point to the plane.
Σελίδα 336 - A spherical polygon is a portion of the surface of a sphere bounded by three or more arcs of great circles. The...
Σελίδα 73 - A chord is a straight line joining the extremities of an arc ; as AB.
Σελίδα 328 - A sphere is a solid bounded by a surface all points of which are equally distant from a point within called the centre.
Σελίδα 205 - S' denote the areas of two © whose radii are R and R', and diameters D and D', respectively. Then, | = "* § = ££ = £• <§337> That is, the areas of two circles are to each other as the squares of their radii, or as the squares of their diameters.
Σελίδα 170 - 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.
Σελίδα 224 - The perpendiculars from the vertices of a triangle to the opposite sides are the bisectors of the angles of the triangle formed by joining the feet of the perpendiculars.
Σελίδα 325 - A right circular cone may be generated by the revolution of a right triangle about one of its legs as an axis.