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].1814 |
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Results 6-10 of 59
Page 3-22
... half the line bisected , and of the square of the line made up of the half and the part produced . Let the straight line AB be bisected in C and produced to the point D ; the squares of AD , DB are double of the squares of AC , CD ...
... half the line bisected , and of the square of the line made up of the half and the part produced . Let the straight line AB be bisected in C and produced to the point D ; the squares of AD , DB are double of the squares of AC , CD ...
Page 3-23
... half Book II . a right angle ; therefore AEB is a right angle : And be- cause EBC is half a right angle , DBG is also half a right 15. 1 . angle , for they are vertically opposite ; but BDG is a right angle , because it is equal to the ...
... half Book II . a right angle ; therefore AEB is a right angle : And be- cause EBC is half a right angle , DBG is also half a right 15. 1 . angle , for they are vertically opposite ; but BDG is a right angle , because it is equal to the ...
Page 82
... half of the angle BGC , and the angle at D half of the an- gle EHF : Therefore the angle at A is equal to the angle at D. Wherefore , in equal circles , & c . Q. E. D. BOOK III PROP . XXVIII . THEOR . In equal 82 THE ELEMENTS.
... half of the angle BGC , and the angle at D half of the an- gle EHF : Therefore the angle at A is equal to the angle at D. Wherefore , in equal circles , & c . Q. E. D. BOOK III PROP . XXVIII . THEOR . In equal 82 THE ELEMENTS.
Page 101
... half of AD , and AF the half of AB , AE is equal to AF ; A wherefore the sides opposite to these are equal , viz . FG to GE ; in the same manner it may be de- monstrated that GH , GK are each F of them equal to FG or GE : there- fore ...
... half of AD , and AF the half of AB , AE is equal to AF ; A wherefore the sides opposite to these are equal , viz . FG to GE ; in the same manner it may be de- monstrated that GH , GK are each F of them equal to FG or GE : there- fore ...
Page 107
... half of the angle BCD , and CDF , the half of CBE ; the angle FCD is equal to FDC ; wherefore the side CF is equal to the side FD : In like manner 6.1 . it may be demonstrated that FB , FA , FE , are each of them equal to FC or FD ...
... half of the angle BCD , and CDF , the half of CBE ; the angle FCD is equal to FDC ; wherefore the side CF is equal to the side FD : In like manner 6.1 . it may be demonstrated that FB , FA , FE , are each of them equal to FC or FD ...
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Common terms and phrases
ABC is given AC is equal altitude angle ABC angle BAC base BC bisected BOOK XI centre circle ABCD circumference common logarithm cone cylinder demonstrated described diameter drawn equal angles equiangular equimultiples Euclid 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 meet multiple opposite parallel parallelogram AC perpendicular point F polygon prism proportionals proposition pyramid Q. E. D. PROP radius rectangle CB rectangle contained rectilineal figure remaining angle right angles segment side BC similar sine solid angle solid parallelopipeds square of AC straight line AB straight line BC tangent THEOR third triangle ABC triplicate ratio vertex wherefore
Popular passages
Page 3-7 - IF a straight line be divided into any two parts, the square of the whole line is equal to the squares of the two parts, together with twice the rectangle contained by the parts.
Page 16 - Any two sides of a triangle are together greater than the third side.
Page 26 - 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 16 - If, from the ends of the 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. Let...
Page 304 - 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 4 - DL is equal to DG, and DA, DB, parts of them, are equal ; therefore the remainder AL is equal to the remainder (3. Ax.) BG : But it has been shewn that BC is equal to BG ; wherefore AL and BC are each of them equal to BG ; and things that are equal to the same are equal to one another ; therefore the straight line AL is equal to BC.
Page 147 - 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 3-16 - 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.
Page 159 - SIMILAR triangles are to one another in the duplicate ratio of their homologous sides.