The Essentials of GeometryD.C. Heath & Company, 1899 - 395 σελίδες |
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Σελίδα 4
... perpendicular , is perpen- dicular to . Il , parallel , is parallel to . ≈ , equivalent , is equivalents , perpendiculars . to . > , is greater than . < , is less than . ... , therefore . Z , angle . , angles . Ils , parallels ...
... perpendicular , is perpen- dicular to . Il , parallel , is parallel to . ≈ , equivalent , is equivalents , perpendiculars . to . > , is greater than . < , is less than . ... , therefore . Z , angle . , angles . Ils , parallels ...
Σελίδα 6
... perpendicular ( 1 ) to each other . Thus , if from point A in straight line CD line AB be drawn in such a way as to make angles BAC and BAD equal , each of these angles is a right angle , and AB and CD are perpendicular to each other ...
... perpendicular ( 1 ) to each other . Thus , if from point A in straight line CD line AB be drawn in such a way as to make angles BAC and BAD equal , each of these angles is a right angle , and AB and CD are perpendicular to each other ...
Σελίδα 7
... perpendicular to AB . 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 ...
... perpendicular to AB . 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 ...
Σελίδα 9
... perpendicular to AB at C. [ At a given point in a straight line , a perpendicular to the line can be drawn . ] ( § 25 ) Then , it is evident that the sum of angles ACD and BCD is equal to the sum of angles ACE and BCE . But since CE is ...
... perpendicular to AB at C. [ At a given point in a straight line , a perpendicular to the line can be drawn . ] ( § 25 ) Then , it is evident that the sum of angles ACD and BCD is equal to the sum of angles ACE and BCE . But since CE is ...
Σελίδα 11
... I as follows : Hypothesis . If a point be taken in a given straight line , Conclusion . A perpendicular to the line at the given point can be drawn , and but one . 39. Sch . II . We may enunciate Prop . RECTILINEAR FIGURES . 11.
... I as follows : Hypothesis . If a point be taken in a given straight line , Conclusion . A perpendicular to the line at the given point can be drawn , and but one . 39. Sch . II . We may enunciate Prop . RECTILINEAR FIGURES . 11.
Άλλες εκδόσεις - Προβολή όλων
Συχνά εμφανιζόμενοι όροι και φράσεις
AB² ABCD AC² adjacent angles altitude apothem approach the limit 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 equal respectively 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 Prove 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 58 - The straight line joining the middle points of two sides of a triangle is parallel to the third side, and equal to half of it.
Σελίδα 322 - A right circular cylinder may be generated by the revolution of a rectangle about one of its sides as an axis.
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 336 - A spherical polygon is a portion of the surface of a sphere bounded by three or more arcs of great circles. The...
Σελίδα 151 - If one leg of a right triangle is double the other, the perpendicular from the vertex of the right angle to the hypotenuse divides it into segments which are to each other as 1 to 4.
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 73 - A chord is a straight line joining the extremities of an arc ; as AB.
Σελίδα 202 - The circumferences of two circles are to each other as their radii. Given C and C" the circumferences of two © whose radii are R and R', respectively.