The Essentials of GeometryD.C. Heath & Company, 1899 - 395 σελίδες |
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Σελίδα 17
... bisects an angle bisects also its vertical angle . ( If OE bisects ZAOC , and these are equal to respectively . ) ZAOE = LCOE ; E BOF and DOF , A Ο B X 11. The bisectors of a pair of vertical angles lie RECTILINEAR FIGURES . 17.
... bisects an angle bisects also its vertical angle . ( If OE bisects ZAOC , and these are equal to respectively . ) ZAOE = LCOE ; E BOF and DOF , A Ο B X 11. The bisectors of a pair of vertical angles lie RECTILINEAR FIGURES . 17.
Σελίδα 37
... bisects the supplementary adjacent angle . DCE and ( Fig . of Ex . 12. Let CE bisect ZACD , and suppose CF 1 CE ; sum of ACD and BCD = 2 rt . ; then sum of BCD 1 rt . Z ; but sum of DCE and DCF is also 1 rt . the theorem follows ...
... bisects the supplementary adjacent angle . DCE and ( Fig . of Ex . 12. Let CE bisect ZACD , and suppose CF 1 CE ; sum of ACD and BCD = 2 rt . ; then sum of BCD 1 rt . Z ; but sum of DCE and DCF is also 1 rt . the theorem follows ...
Σελίδα 42
... bisects the base . 2. The perpendicular from the vertex to the base of an isosceles triangle bisects the vertical angle . 95. Cor . II . An equilateral triangle is also equiangular . PROP . XXXI . THEOREM . 96. ( Converse of Prop . XXX ...
... bisects the base . 2. The perpendicular from the vertex to the base of an isosceles triangle bisects the vertical angle . 95. Cor . II . An equilateral triangle is also equiangular . PROP . XXXI . THEOREM . 96. ( Converse of Prop . XXX ...
Σελίδα 52
... bisect each other at right angles . A B A E D C ( AC and BD bisect each other at rt . by § 43. ) EXERCISES . 31. The bisector of the vertical angle of an isosceles triangle bisects the base at right angles . ( Fig . of Prop . XXX . In ...
... bisect each other at right angles . A B A E D C ( AC and BD bisect each other at rt . by § 43. ) EXERCISES . 31. The bisector of the vertical angle of an isosceles triangle bisects the base at right angles . ( Fig . of Prop . XXX . In ...
Σελίδα 57
... bisects the base , the triangle is isosceles . ( Fig . of Prop . XXX . △ ACD and BCD are equal by § 63. ) 40. The bisectors of the equal angles of an isosceles triangle form , with the base , another isosceles triangle . 41. If from ...
... bisects the base , the triangle is isosceles . ( Fig . of Prop . XXX . △ ACD and BCD are equal by § 63. ) 40. The bisectors of the equal angles of an isosceles triangle form , with the base , another isosceles triangle . 41. If from ...
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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.