The Elements of Euclid; viz. the first six books, together with the eleventh and twelfth. Also the book of Euclid's Data. By R. Simson. To which is added, A treatise on the construction of the trigonometrical canon [by J. Christison] and A concise account of logarithms [by A. Robertson].1834 |
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Page 136
... vertex to the point of section , divides the outward angle of the triangle into two equal angles . Let ABC be a triangle , and let one of its sides BA be pro- duced to E ; and let the outward angle CAE be divided into two equal angles ...
... vertex to the point of section , divides the outward angle of the triangle into two equal angles . Let ABC be a triangle , and let one of its sides BA be pro- duced to E ; and let the outward angle CAE be divided into two equal angles ...
Page 186
... vertex A , are greater than the third angle at the same point , which is one of the angles of the polygon BCDEF ; therefore all the angles at the bases of the triangles are to- gether greater than all the angles of the polygon : and be ...
... vertex A , are greater than the third angle at the same point , which is one of the angles of the polygon BCDEF ; therefore all the angles at the bases of the triangles are to- gether greater than all the angles of the polygon : and be ...
Page 221
... vertex the point D : the pyramid ABCD may be divided into two equal and similar pyramids having triangular bases , and similar to the whole ; and into two equal prisms which together shall be greater than half of the whole pyramid . 1 ...
... vertex the point D : the pyramid ABCD may be divided into two equal and similar pyramids having triangular bases , and similar to the whole ; and into two equal prisms which together shall be greater than half of the whole pyramid . 1 ...
Page 222
... vertex the point D. And because HK is parallel to AB , a side of the triangle ADB , the triangle ADB is equiangular ... vertex the point D , is similar * to the pyramid of which the base is the triangle HKL , and vertex the same ...
... vertex the point D. And because HK is parallel to AB , a side of the triangle ADB , the triangle ADB is equiangular ... vertex the point D , is similar * to the pyramid of which the base is the triangle HKL , and vertex the same ...
Page 223
... vertex the point K : but this pyramid is equal to the pyramid , the base of which is the C. 11 .. triangle AEG , and vertex the point H ; because they are con- tained by equal and similar planes : wherefore the prism having the ...
... vertex the point K : but this pyramid is equal to the pyramid , the base of which is the C. 11 .. triangle AEG , and vertex the point H ; because they are con- tained by equal and similar planes : wherefore the prism having the ...
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Common terms and phrases
ABC is given altitude angle ABC angle BAC base BC BC is equal bisected centre circle ABCD circumference common logarithm cone Constr cylinder demonstrated described diameter draw drawn equal angles equiangular equimultiples Euclid ex æquali excess fore given angle given in magnitude given in position given in species given magnitude given ratio given straight line gnomon greater join less Let ABC logarithm multiple parallel parallelogram perpendicular plane angles polygon prism Prop proportionals Q. E. D. PROPOSITION radius ratio of AE rectangle contained rectilineal figure remaining angle right angles segment shewn sides BA similar sine solid angle solid parallelopiped square of AC straight line AB straight line BC tangent THEOR three plane angles tiple triangle ABC vertex wherefore
Popular passages
Page 32 - 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 138 - 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 39 - If a straight line be divided into any two parts, the rectangle contained by the whole and one of the parts, is equal to the rectangle contained by the two parts, together with the square of the aforesaid part.
Page 22 - If a straight line fall upon two parallel straight lines, it makes the alternate angles equal to one another...
Page 41 - 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, together •with the square on half the line bisected, is equal to the square on the straight line which is made up of the half and the part produced.
Page 5 - If two triangles have two sides of the one equal to two sides of the other, each to each, but the...
Page 38 - IF a straight line be divided into any two parts, the rectangles contained by the whole and each of the parts, are together equal to the square of the whole line. Let the straight line AB be divided...
Page 262 - Again ; the mathematical postulate, that " things which are equal to the same are equal to one another," is similar to the form of the syllogism in logic, which unites things agreeing in the middle term.
Page 89 - PBOR. —To describe an isosceles triangle, having each of the angles at the base, double of the third angle. Take any straight...
Page 165 - Wherefore, in equal circles &c. QED PROPOSITION B. THEOREM If the vertical angle of a triangle be bisected by a straight line which likewise cuts the base, the rectangle contained by the sides of the triangle is equal to the rectangle contained by the segments of the base, together with the square on the straight line which bisects the angle.