## 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 |

### From inside the book

Results 1-5 of 43

Page 2

...

...

**vertex**of the angle , that is , at the point in which the straight lines that contain the angle meet one another , ' is put between the other two letters , 6 and one of these two is somewhere upon one of those straight lines , and the ... Page 10

...

...

**vertices**, as D , be within the other triangle ACB , produce AC , AD to E , F : therefore , because , AC is equal to AD in the triangle ACD , the angles ECD , FDC , the other side of the base CD , are equal * to one another : but the ... Page 11

...

...

**vertex**of one triangle is upon a side of the other , needs no demonstration . Therefore , upon the same base , and on the same side of it , there cannot be two triangles that have their sides , which are terminated in one extremity of ... Page 27

...

...

**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 . COR . 2. All the exterior ... Page 132

... segment , as the greater segment is to the less . IV . The altitude of any figure is the straight line drawn from its

... segment , as the greater segment is to the less . IV . The altitude of any figure is the straight line drawn from its

**vertex**perpendicular to the base . PROPOSITION I. THEOREM . - Triangles and parallelograms of the ...### Other editions - View all

### Common terms and phrases

ABC is given AC is equal altitude angle ABC angle BAC base BC bisected centre circle ABCD circle EFGH 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 point F polygon prism Prop proportionals Q. E. D. PROPOSITION radius ratio of AE rectangle CB 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.-If 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.