The Elements of Euclid, the parts read in the University of Cambridge [book 1-6 and parts of book 11,12] with geometrical problems, by J.W. Colenso1846 |
From inside the book
Results 6-10 of 100
Page 9
... greater cut off AG equal to AF the less ( 1. 3 ) , and join FC , GB . Then , because AF is equal to AG , and AB to AC ( Hyp . ) , the two sides FA , AC are equal to the two GA , AB , each to each , and they contain the angle FAG common ...
... greater cut off AG equal to AF the less ( 1. 3 ) , and join FC , GB . Then , because AF is equal to AG , and AB to AC ( Hyp . ) , the two sides FA , AC are equal to the two GA , AB , each to each , and they contain the angle FAG common ...
Page 11
... greater than the other . Let AB be the greater ; and from it cut off DB equal to AC the less , and join DC : Then , because in the triangles DBC , ACB , DB is equal to AC , and BC common to both triangles , the two sides DB , BC are ...
... greater than the other . Let AB be the greater ; and from it cut off DB equal to AC the less , and join DC : Then , because in the triangles DBC , ACB , DB is equal to AC , and BC common to both triangles , the two sides DB , BC are ...
Page 12
... greater than it - which is impossible . F R But , if one of the vertices , as D , be within the other triangle ACB ... greater than the angle BCD ; therefore also the angle FDC is greater than the angle BCD ; much more then is the angle ...
... greater than it - which is impossible . F R But , if one of the vertices , as D , be within the other triangle ACB ... greater than the angle BCD ; therefore also the angle FDC is greater than the angle BCD ; much more then is the angle ...
Page 15
... greater -- which is absurd : Where- B E fore two straight lines cannot have a common segment . PROP . XII . PROB . To draw a straight line , perpendicular to a given straight line of unlimited length , from a given point without it ...
... greater -- which is absurd : Where- B E fore two straight lines cannot have a common segment . PROP . XII . PROB . To draw a straight line , perpendicular to a given straight line of unlimited length , from a given point without it ...
Page 18
... greater -- which is absurd Therefore BE is not in the same straight line with BC : And in like manner it may be demon- strated , that no other can be in the same straight line with it but BD : Therefore BD is in the same straight line ...
... greater -- which is absurd Therefore BE is not in the same straight line with BC : And in like manner it may be demon- strated , that no other can be in the same straight line with it but BD : Therefore BD is in the same straight line ...
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The Elements of Euclid, the Parts Read in the University of Cambridge [Book ... Euclides No preview available - 2016 |
Common terms and phrases
ABCD adjacent angles angle ABC angle ACB angle BAC angle BCD angle EDF angle equal base BC BC is equal centre chord circle ABC circumference cuts the circle diameter double draw equal angles equal to F equiangular equilateral triangle equimultiples exterior angle fore given circle given line given point given straight line gnomon greater ratio inscribed intersection isosceles triangle less Let ABC Let the straight lines be drawn lines drawn meet multiple opposite angles opposite sides parallel to BC parallelogram pentagon perpendicular plane polygon PROB produced proportionals Q.E.D. PROP rectangle contained rectilineal figure remaining angle right angles right-angled triangle segment semicircle shew shewn square of AC straight line &c straight line AB THEOR touches the circle triangle ABC twice the rectangle Wherefore
Popular passages
Page 42 - To a given straight line to apply a parallelogram, which shall be equal to a given triangle, and have one of its angles equal to a given rectilineal angle.
Page 4 - Let it be granted that a straight line may be drawn from any one point to any other point.
Page 33 - F, which is the common vertex of the triangles: that is », together with four right angles. 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 62 - If a straight line be divided into two equal parts, and also into two unequal parts; the rectangle contained by the unequal parts, together with the square of the line between the points of section, is equal to the square of half the line.
Page 22 - If from the ends of a side of a triangle, there be drawn two straight lines to a point within the triangle, these shall be less than the other two sides of the triangle, but shall contain a greater angle.
Page 58 - If there be two straight lines, one of which is divided into any number of parts, the rectangle contained by the two straight lines is equal to the rectangles contained by the undivided line, and the several parts of the divided line.
Page 146 - ... may be demonstrated from what has been said of the pentagon : and likewise a circle may be inscribed in a given equilateral and equiangular hexagon, and circumscribed about it, by a method like to that used for the pentagon.
Page 194 - 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 2 - 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 : 16.
Page 69 - To divide a given straight line into two parts, so that the rectangle contained by the whole, and one of the parts, may be equal to the square of the other part.