Euclide's Elements: The Whole Fifteen Books Compendiously Demonstrated: with Archimede's Theorems of the Sphere and Cylinder, Investigated by the Method of Indivisibles. Also, Euclide's Data, and A Brief Treatise [added by Flussas] of Regular SolidsW. and J. Mount, 1751 - 384 Seiten |
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Seite 2
... Perpendicular to that ( AB ) where- on it ftandeth . Note , When Several angles meet at the fame point ( as at G ) each particular angle is described by three letters ; wherè- of the middle letter fheweth the angular point , and the two ...
... Perpendicular to that ( AB ) where- on it ftandeth . Note , When Several angles meet at the fame point ( as at G ) each particular angle is described by three letters ; wherè- of the middle letter fheweth the angular point , and the two ...
Seite 10
... perpendicular re- quired . For the triangles DAC , DCB are mutually ( c ) equila- teral , ( d ) therefore the angle ADC = CDB ; ( e ) therefore DC is perpendicular . Which was to be done . The practice of this and the following is ...
... perpendicular re- quired . For the triangles DAC , DCB are mutually ( c ) equila- teral , ( d ) therefore the angle ADC = CDB ; ( e ) therefore DC is perpendicular . Which was to be done . The practice of this and the following is ...
Seite 11
... perpendicular GC . Because the angle DGB ( c ) to a right - angle - + - CGD , and the angle DGA ( d ) to a right - angle - DGC ; therefore the angle DGB -- DGA ( e ) to two right - angles . Which was to be demonftrated . ་ = Corollaries ...
... perpendicular GC . Because the angle DGB ( c ) to a right - angle - + - CGD , and the angle DGA ( d ) to a right - angle - DGC ; therefore the angle DGB -- DGA ( e ) to two right - angles . Which was to be demonftrated . ་ = Corollaries ...
Seite 13
... perpendicular AB , let fall from any point A to the other line BC , shall fall on that fide the acute angle is of . For if AC , drawn on the fide of the obtufe - angle , be a perpendicular , then in the triangle AEC , fhall the angles ...
... perpendicular AB , let fall from any point A to the other line BC , shall fall on that fide the acute angle is of . For if AC , drawn on the fide of the obtufe - angle , be a perpendicular , then in the triangle AEC , fhall the angles ...
Seite 25
... perpendicular FG , meeting the circumference in F ; and draw EF . ( a ) Then is EFq ( EAq ) = EGq + FGq , ( b ) There- EAqEGq = GFq . Which was to be done . PROBLEM III . Fig . 45 . Any two fides of a right - angled triangle ABC , being ...
... perpendicular FG , meeting the circumference in F ; and draw EF . ( a ) Then is EFq ( EAq ) = EGq + FGq , ( b ) There- EAqEGq = GFq . Which was to be done . PROBLEM III . Fig . 45 . Any two fides of a right - angled triangle ABC , being ...
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Beliebte Passagen
Seite 18 - If two triangles have one angle of the one equal to one angle of the other and the sides about these equal angles proportional, the triangles are similar.
Seite 281 - ... which, when produced, the perpendicular falls, and the straight line intercepted, without the triangle, between the perpendicular and the obtuse angle. Let ABC be an obtuse-angled triangle, having the obtuse angle ACB, and from the point A let AD be drawn...
Seite 2 - XV. A Circle is a plain figure contained under one line, which is called a circumference ; unto which all lines, drawn from one point within the figure, and falling upon the circumference thereof, are equal the one to the other. XVI. And that point is called the center of the circle. XVII. A Diameter of a circle is a right-line drawn thro' the center thereof, and ending at the circumference on either fide, dividing the circle into two equal parts.
Seite 95 - An EVEN NUMBER is that which can be divided into two equal whole numbers.
Seite 381 - Rule. Multiply the Logarithm of the given number by the Index of the proposed power, and the product will be the Logarithm, whose natural number is the power required.
Seite 197 - ... than the other side, an obtuse-angled ; and if greater, an acute-angled cone. XIX. The axis of a cone is the fixed straight line about which the triangle revolves. XX. The base of a cone is the circle described by that side containing the right angle, which revolves. XXI. A cylinder is a solid figure described by the revolution of a rightangled parallelogram about one of its sides which remains fixed.
Seite 196 - ... are •not in the fame Superficies: Or, a folid Angle is that which is contained under more than two plane Angles which are not in the fame Superficies, but being all at one Point. XII. A Pyramid is a folid Figure comprehended under divers Planes fet upon one Plane, and put together at one Point. ' «. XIII. A Prifm is a folid Figure contained under Planes, whereof the two oppofite are equal, fimilar, and parallel, and the others Parallelograms.
Seite 353 - To divide one number by another.* Subtract the logarithm of the divisor from the logarithm of the dividend, and the remainder will be the logarithm of the quotient.
Seite 2 - ... parts. XVIII. A Semicircle is a figure which is contained under the diameter and that part of the circumference which is cut off by the diameter. In the circle EABCD, E is the center, AC the diameter > ABC the femi circle.
Seite 51 - ... touch the circumference of the circle. IV A right-lined figure is faid to be defcribed about a circle, when all the fides of the figure which is circumfcribed touch the periphery of the circle V.