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 8
... circle BCD , and from the centre B , at the distance BA , defcribe the circle ACE ; and from the point C , in which the circles cut one another , draw the straight b . Poft . lines b CA , CB to the points A , B : ABC fhall finition . be ...
... circle BCD , and from the centre B , at the distance BA , defcribe the circle ACE ; and from the point C , in which the circles cut one another , draw the straight b . Poft . lines b CA , CB to the points A , B : ABC fhall finition . be ...
Page 70
... circle is the figure con- tained by a straight line and the cir- cumference it cuts off . VI . An angle in a fegment ... ABC be the given circle ; it is required to find its centre . Draw find Dra Draw within it any ftraight line AB , 1 ...
... circle is the figure con- tained by a straight line and the cir- cumference it cuts off . VI . An angle in a fegment ... ABC be the given circle ; it is required to find its centre . Draw find Dra Draw within it any ftraight line AB , 1 ...
Page 71
... circle ABC : In the fame manner it can be shown , that no other point but F is the centre ; that is , F is the centre of the circle ABC : Which was to be found . COR . From this it is manifeft , that if in a circle a straight line ...
... circle ABC : In the fame manner it can be shown , that no other point but F is the centre ; that is , F is the centre of the circle ABC : Which was to be found . COR . From this it is manifeft , that if in a circle a straight line ...
Page 72
... ABC be a circle , and A , B any two points in the cir cumference ; the ftraight line drawn from A to B fhall fall within the circle . Take any point in AB as E ; find D the centre of the circle ABC , join AD , DB and DE , and let DE ...
... ABC be a circle , and A , B any two points in the cir cumference ; the ftraight line drawn from A to B fhall fall within the circle . Take any point in AB as E ; find D the centre of the circle ABC , join AD , DB and DE , and let DE ...
Page 74
... circle , & c . Q. E. D. I PROP . V. THE OR . F two circles cut one another , they fhall not have the fame centre . Let the two circles ABC , CDG cut one another in the points B , C ; they have not the same centre . For , if it be ...
... circle , & c . Q. E. D. I PROP . V. THE OR . F two circles cut one another , they fhall not have the fame centre . Let the two circles ABC , CDG cut one another in the points B , C ; they have not the same centre . For , if it be ...
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Common terms and phrases
ABCD adjacent angles alfo alfo equal alſo angle ABC angle ACB angle BAC arch bafe baſe BC is equal becauſe the angle bifected Book VII cafe centre circle ABC circumference co-fine defcribed demonftrated diameter draw drawn equal angles equiangular equilateral equilateral polygon equimultiples Euclid exterior angle faid fame manner fame ratio fame reaſon fecond fection fegment femicircle fhewn fimilar fince firft firſt folid fore fquare of AC ftraight line AB fuch given ſtraight line greater impoffible infcribed interfection join lefs leſs Let ABC line BC magnitudes muſt oppofite angle parallel parallelepiped parallelogram perpendicular polygon prifm propofition proportionals radius rectangle contained rectilineal figure remaining angle right angles ſpace ſpherical triangle ſquare tangent thefe THEOR theſe thoſe touches the circle triangle ABC wherefore
Popular passages
Page 18 - 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...