Geometrical Problems Deducible from the First Six Books of Euclid, Arranged and Solved: To which is Added an Appendix Containing the Elements of Plane Trigonometry ...J. Smith, 1819 - 377 σελίδες |
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Αποτελέσματα 1 - 5 από τα 100.
Σελίδα 10
... triangle ACD , and bisect the angle DCA by the straight line CE ; the angles ... ABC ; bisect the angles CAB , CBA by the lines AD , BD meeting in D , and ... triangle EDF is equiangular , and conse- quently equilateral ; therefore DE EF ...
... triangle ACD , and bisect the angle DCA by the straight line CE ; the angles ... ABC ; bisect the angles CAB , CBA by the lines AD , BD meeting in D , and ... triangle EDF is equiangular , and conse- quently equilateral ; therefore DE EF ...
Σελίδα 92
... triangle is greater than the differ- ence between the other two sides . Let ABC be a triangle ; any of its sides is greater than the difference of the other two . B Let AC be greater than AB ; and cut off AD = AB ; join BD ; then the angle ...
... triangle is greater than the differ- ence between the other two sides . Let ABC be a triangle ; any of its sides is greater than the difference of the other two . B Let AC be greater than AB ; and cut off AD = AB ; join BD ; then the angle ...
Σελίδα 93
... triangle perpendiculars be drawn to the sides ; they are together equal to a perpendicular drawn from any of the angles to the opposite side . From any point D within the ... triangle ABC be bisected in Sect . 3. ] 93 GEOMETRICAL PROBLEMS .
... triangle perpendiculars be drawn to the sides ; they are together equal to a perpendicular drawn from any of the angles to the opposite side . From any point D within the ... triangle ABC be bisected in Sect . 3. ] 93 GEOMETRICAL PROBLEMS .
Σελίδα 94
... triangle ABC be bisected in the points D , E , F ; join DE , EF , FD ; the triangle DEF is one fourth of the triangle ABC . F B E Since AB and AC are bisected in D and F , ( Eucl . vi . 2. ) DF is parallel to BC ; and for the same ...
... triangle ABC be bisected in the points D , E , F ; join DE , EF , FD ; the triangle DEF is one fourth of the triangle ABC . F B E Since AB and AC are bisected in D and F , ( Eucl . vi . 2. ) DF is parallel to BC ; and for the same ...
Σελίδα 95
... angle contained by the base and the latter . Let ABC be an isosceles triangle , having the side AB equal to AC . From B draw any line BD , and also BE cutting off DE equal to DB ; the angle ABD is double of CBE . B A E For the angle DCB ...
... angle contained by the base and the latter . Let ABC be an isosceles triangle , having the side AB equal to AC . From B draw any line BD , and also BE cutting off DE equal to DB ; the angle ABD is double of CBE . B A E For the angle DCB ...
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Άλλες εκδόσεις - Προβολή όλων
Συχνά εμφανιζόμενοι όροι και φράσεις
ABCD angle ABC base bisects the angle centre chord circle ABC circles cut circles touch circumference describe a circle divided draw any line drawn parallel duplicate ratio equal angles equiangular Eucl extremities given angle given circle given in position given line given point given ratio given straight line given triangle inscribed intercepted isosceles triangle Join AE Join BD Let AB Let ABC let fall line given line joining line required lines be drawn lines drawn mean proportional opposite side parallel to BC parallelogram pendicular perpendicular be drawn point of bisection point of contact point of intersection quadrant radius rectangle contained right angles right-angled triangle segments semicircle shewn tangent touches the circle trapezium triangle ABC vertex vertical angle
Δημοφιλή αποσπάσματα
Σελίδα 124 - If a straight line be drawn parallel to one of the sides of a triangle, it shall cut the other sides, or those sides produced, proportionally; and if the sides, or the sides produced, be cut proportionally, the straight '.line which joint the points of section, shall be parallel to the remaining side of the triangle.
Σελίδα xiii - IF from any point without a circle two straight lines be drawn, one of which cuts the circle, and the other touches it ; the rectangle contained by the whole line which cuts the circle, and the part of it without the circle,. shall be equal to the square of the line which touches it.
Σελίδα 158 - Iff a straight line be divided into any two parts, four times the rectangle contained by the whole line, and one of the parts, together with the square of the other...
Σελίδα 160 - Upon a given straight line, to describe a segment of a circle, containing an angle equal to a given angle. Let AB be the given straight line, and C the given angle ; it is required to.
Σελίδα 230 - To describe an isosceles triangle, having each of the angles at the base double of the third angle.
Σελίδα 157 - AB be the given straight line ; it is required to divide it into two parts, so that the rectangle contained by the whole, and one of the parts, shall be equal to the square of the other part.
Σελίδα 33 - FC ; (ax. 1.) and FA, FB, FC are equal to one another : wherefore the circle described from the centre F, at the distance of one of them, will pass through the extremities of the other two, and be described about the triangle ABC.
Σελίδα xxv - ... the squares of the diagonals, is equal to the sum of the squares of the bisected sides together with four times the square of the line joining those points of bisection.
Σελίδα 248 - If an equilateral triangle be inscribed in a circle, and the adjacent arcs cut off by two of its sides be bisected, the line joining the points of bisection shall be trisected by the sides.
Σελίδα 355 - The sine of an angle is equal to the sine of its supplement. The sine rule Consider fig.