Elements of Geometry: Containing the First Six Books of Euclid, with Two Books on the Geometry of Solids. To which are Added, Elements of Plane and Spherical Trigonometry |
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Page vii
... those of the fubfidiary propofitions which EUCLID introduced for the fake of the rest ; they are exprefled here in the manner that feemed best adapted to the new notation . The alterations above mentioned are the most material that have ...
... those of the fubfidiary propofitions which EUCLID introduced for the fake of the rest ; they are exprefled here in the manner that feemed best adapted to the new notation . The alterations above mentioned are the most material that have ...
Page ix
... those , by the introduction of which , the Geometry of Solids is much short- ened , while all the real accuracy of the demon- strations is preserved ; and therefore , to follow , as EUCLID has done , the rule that excludes this , and ...
... those , by the introduction of which , the Geometry of Solids is much short- ened , while all the real accuracy of the demon- strations is preserved ; and therefore , to follow , as EUCLID has done , the rule that excludes this , and ...
Page xii
... which are the foundation of those new applications of Trigonometry that have been introduced with so much advantage into the high- er Geometry . In the Spherical Trigonometry , the rules for preventing the In xii PREFACE .
... which are the foundation of those new applications of Trigonometry that have been introduced with so much advantage into the high- er Geometry . In the Spherical Trigonometry , the rules for preventing the In xii PREFACE .
Page xiii
... those who make the objection just stated , do not seem to have reflected sufficiently on the end of Mathema- tical Demonstration , which is not only to prove the truth of a certain proposition , but to shew its necessary connection with ...
... those who make the objection just stated , do not seem to have reflected sufficiently on the end of Mathema- tical Demonstration , which is not only to prove the truth of a certain proposition , but to shew its necessary connection with ...
Page xv
... those that are be- low it , would never be very expert in tracing its connection with those that are above it ; and that , as he had not been careful in laying the founda- tion , he would never be fuccessful in raising the ...
... those that are be- low it , would never be very expert in tracing its connection with those that are above it ; and that , as he had not been careful in laying the founda- tion , he would never be fuccessful in raising the ...
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Common terms and phrases
ABCD alfo alſo alſo equal angle ABC angle ACB angle BAC arch baſe baſe BC BC is equal becauſe becauſe the angle biſected Book VII caſe cauſe centre circle ABC circumference co-fine demonſtrated deſcribed diameter draw drawn equal angles equiangular equilateral equilateral polygon equimultiples Euclid exterior angle fame reaſon fides fimilar fince firſt folid fore given ſtraight line greater inſcribed interfect join leſs Let ABC line BC magnitudes oppoſite parallel parallelepiped parallelogram paſs paſſes perpendicular plane polygon priſm proportionals propoſition Q. E. D. PROP radius rectangle contained rectilineal figure remaining angle right angles ſame ſame manner ſame ratio ſecond ſection ſegment ſhall be equal ſhewn ſide ſolid ſpace ſpherical triangle ſquare of AC ſtand ſuch ſum ſuppoſed tangent THEOR theſe thoſe touches the circle triangle ABC wherefore
Popular passages
Page 19 - If two triangles have two angles of the one equal to two angles of the other, each to each, and one side equal to one side, viz. either the sides adjacent to the equal...
Page 155 - 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.
Page 17 - If, at a point in a straight line, two other straight lines upon the opposite sides of it, make the adjacent angles, together equal to two right angles, these two straight lines shall be in one and the same straight line.
Page 9 - Wherefore, from the given point A, a straight line AL has been drawn equal to the given straight line BC.
Page 3 - A circle is a plane figure contained by one line, which is called the circumference, and is such that all straight lines drawn from a certain point within the figure to the circumference, are equal to one another.
Page 23 - Therefore all the angles of the figure, together with four right angles, are equal to twice as many right angles as the figure has sides.
Page 12 - ABC: and it has also been proved that the angle FBC is equal to the angle GCB, which are the angles upon the other side of the base. Therefore the angles at the base, &c.
Page 6 - Let it be granted that a straight line may be drawn from any one point to any other point.
Page 156 - But by the hypothesis, it is less than a right angle ; which is absurd. Therefore the angles ABC, DEF are not unequal, that is, they are equal : And the angle at A is equal to the angle at D ; wherefore...
Page 44 - 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...