The First Six and the Eleventh and Twelfth Books of Euclid's Elements: With Notes and Illustrations, and an Appendix in Five Books |
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Page 175
... cone is called a right - angled cone ; if it be less than the other leg , an obtuse - angled , and if greater , an acute - angled cone . 22. The axis of a cone is the fixed straight line about which the triangle revolves . 23. The base ...
... cone is called a right - angled cone ; if it be less than the other leg , an obtuse - angled , and if greater , an acute - angled cone . 22. The axis of a cone is the fixed straight line about which the triangle revolves . 23. The base ...
Page 218
... CONE is a third part of a cylinder on the same base , and of equal altitude . Let a cone have the same base with a cylinder , viz . , the circle ABCD , and the same altitude . The cone is the third part of the cylinder ; that is , the ...
... CONE is a third part of a cylinder on the same base , and of equal altitude . Let a cone have the same base with a cylinder , viz . , the circle ABCD , and the same altitude . The cone is the third part of the cylinder ; that is , the ...
Page 219
... cone : but ( XII . 7 . cor . 1. ) this prism is triple of the pyramid upon the same base , of which the vertex is the same with the vertex of the cone ; there- fore the pyramid upon the base AEBFCGDH , having the same vertex with the cone ...
... cone : but ( XII . 7 . cor . 1. ) this prism is triple of the pyramid upon the same base , of which the vertex is the same with the vertex of the cone ; there- fore the pyramid upon the base AEBFCGDH , having the same vertex with the cone ...
Page 220
... cone : neither , as has been demonstrated , is it greater than the triple . Therefore the cylinder is triple of the cone , or the cone is the third part of the cylinder . A cone , therefore , & c . PROP . XI . THEOR . F C CONES and ...
... cone : neither , as has been demonstrated , is it greater than the triple . Therefore the cylinder is triple of the cone , or the cone is the third part of the cylinder . A cone , therefore , & c . PROP . XI . THEOR . F C CONES and ...
Page 221
... cone , and so on , there must at length remain ( XII . lem . 1. ) some segments of the cone which are together less than Z. Let these be the segments upon EO , OF , FP , PG , GR , RH , HS , SE : therefore the remainder of the cone , viz ...
... cone , and so on , there must at length remain ( XII . lem . 1. ) some segments of the cone which are together less than Z. Let these be the segments upon EO , OF , FP , PG , GR , RH , HS , SE : therefore the remainder of the cone , viz ...
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The First Six and the Eleventh and Twelfth Books of Euclid's Elements: With ... Euclid No preview available - 2016 |
Common terms and phrases
ABCD altitude angle ABC angle BAC angle equal BC is equal bisected centre chord circle ABC circumference cone const contained cylinder describe a circle diagonal diameter divided draw equal angles equal to AC equiangular equilateral Euclid exterior angle fore fourth given circle given point given ratio given straight line greater half Hence hypotenuse inscribed join less Let ABC magnitudes manner multiple opposite parallel parallelepiped parallelogram perpendicular polygon polyhedron prism PROB produced PROP proportional proposition pyramid radius rectangle rectilineal figure right angles Schol segments semicircle sides similar similar triangles solid angles square of AC straight lines drawn tangent THEOR third triangle ABC triplicate ratio vertex vertical angle wherefore
Popular passages
Page 94 - 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.
Page 53 - If a straight line be divided into any two parts, the squares of the whole line and of one of the parts are equal to twice the rectangle contained by the whole and that part, together with the square of the other part. Let the straight line AB be divided into any two parts at the point C : the squares of AB, BC shall be equal to twice the rectangle AB, BC, together with the square of AC.
Page 143 - 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 4 - A rhombus is that which has all its sides equal, but its angles are not right angles.
Page 57 - 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 on the other part.
Page 138 - IF a straight line be drawn parallel to one of the sides of a triangle, it shall cut the other sides, or those produced, proportionally; and if the sides, or the sides produced, be cut proportionally, the straight line which joins the points of section shall be parallel to the remaining side of the triangle...
Page 43 - In any right-angled triangle, the square which is described upon the side subtending the right angle, is equal to the squares described upon the sides which contain the right angle.
Page 32 - 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.
Page 40 - 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 36 - PARALLELOGRAMS upon the same base, and between the same parallels, are equal to one another...