Elements of Geometry, Geometrical Analysis, and Plane Trigonometry: With an Appendix, Notes and IllustrationsJames Ballantyne and Company, 1809 - 493 σελίδες |
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Σελίδα vi
... propositions , indeed , might be reached by a sort of calculation ; but such an artificial mode of procedure gives only an apparent facility , and leaves no clear or permanent impression on the mind . We should form a wrong estimate ...
... propositions , indeed , might be reached by a sort of calculation ; but such an artificial mode of procedure gives only an apparent facility , and leaves no clear or permanent impression on the mind . We should form a wrong estimate ...
Σελίδα vii
... propositions , not only beautiful in themselves , but that pave the way to the higher branches of Geometry , or lead im- mediately to valuable practical results . Yet the Appendix , without claiming the same degree of utility , will not ...
... propositions , not only beautiful in themselves , but that pave the way to the higher branches of Geometry , or lead im- mediately to valuable practical results . Yet the Appendix , without claiming the same degree of utility , will not ...
Σελίδα ix
... proposition which has a distinct refe- rence to practice . The last problem is of essential consequence in marine surveying . Having already exceeded the ordinary limits , it perhaps unfortunately became requisite to curtail the Notes ...
... proposition which has a distinct refe- rence to practice . The last problem is of essential consequence in marine surveying . Having already exceeded the ordinary limits , it perhaps unfortunately became requisite to curtail the Notes ...
Σελίδα 9
... to be equal , when applied to each other they wholly coincide ; they are equivalent , if without superposition they yet contain the same measure equally . A PROPOSITION is a distinct undivided portion of ab- stract BOOK I. 9.
... to be equal , when applied to each other they wholly coincide ; they are equivalent , if without superposition they yet contain the same measure equally . A PROPOSITION is a distinct undivided portion of ab- stract BOOK I. 9.
Σελίδα 10
... proposition . A SCHOLIUM is an excursive remark on the nature and application of a train of reasoning . The operations in Geometry suppose the drawing of straight lines and the description of circles , or they require in practice the ...
... proposition . A SCHOLIUM is an excursive remark on the nature and application of a train of reasoning . The operations in Geometry suppose the drawing of straight lines and the description of circles , or they require in practice the ...
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ABCD ANALYSIS angle ABC angle ACB angle BAC bisect centre chord circumference COMPOSITION conse consequently the angle decagon describe a circle diameter distance diverging lines draw drawn equal to BC evidently exterior angle fall the perpendicular given circle given in position given point given ratio given space given straight line greater hence hypotenuse inflected inscribed intercepted intersection isosceles triangle join let fall likewise mean proportional parallel perpendicular point F polygon porism PROB PROP quently radius rectangle rectangle contained regular polygon rhomboid right angles right-angled triangle Scholium segments semicircle semiperimeter sequently side AC similar sine square of AC squares of AB tangent THEOR triangle ABC twice the square vertex vertical angle whence wherefore
Δημοφιλή αποσπάσματα
Σελίδα 460 - The first of four magnitudes is said to have the same ratio to the second which the third has to the fourth, when...
Σελίδα 28 - ... if a straight line, &c. QED PROPOSITION 29. — Theorem. If a straight line fall upon two parallel straight lines, it makes the alternate angles equal to one another ; and the exterior angle equal to the interior and opposite upon the same side ; and likewise the two interior angles upon the same side together equal to two right angles.
Σελίδα 145 - The first and last terms of a proportion are called the extremes, and the two middle terms are called the means.
Σελίδα 34 - All the interior angles of any rectilineal figure, together with four right angles, are equal to twice as many right angles as the figure has sides.
Σελίδα 153 - Componendo, by composition ; when there are four proportionals, and it is inferred that the first together with the second, is to the second, as the third together with the fourth, is to the fourth.
Σελίδα 16 - PROP. V. THEOR. The angles at the base of an isosceles triangle are equal to one another; and if the equal sides be produced, the angles -upon the other side of the base shall be equal. Let ABC be an isosceles triangle, of which the side AB is equal to AC, and let the straight lines AB, AC, be produced to D and E: the angle ABC shall be equal to the angle ACB, and the angle...
Σελίδα 411 - C' (89) (90) (91) (92) (93) 112. In any plane triangle, the sum of any two sides is to their difference as the tangent of half the sum of the opposite angles is to the tangent of half their difference.
Σελίδα 58 - Prove, geometrically, that the rectangle of the sum and the difference of two straight lines is equivalent to the difference of the squares of those lines.
Σελίδα 64 - IF a straight line be bisected, and produced to any point: the rectangle contained by the whole line thus produced, and the part of it produced, together with the square...
Σελίδα 157 - When any number of quantities are proportionals, as one antecedent is to its consequent, so is the sum of all the antecedents to the sum of all the consequents.