## The Elements of Euclid |

### Inni boken

Resultat 1-5 av 17

Side 16

make CE equal to CD , and upon DE describe ( 1 . 1 . ) the equilateral triangle ,

DFE , and join FC ; the straight line FC drawn from the given point C is at right

angles to the given straight line AB . Because DC is equal to CE , and FC

make CE equal to CD , and upon DE describe ( 1 . 1 . ) the equilateral triangle ,

DFE , and join FC ; the straight line FC drawn from the given point C is at right

angles to the given straight line AB . Because DC is equal to CE , and FC

**common**to ... Side 57

than the third , BE , EF are greater than BF ; but AE is equal to EB ; therefore AE ,

EF , that is , AF , is А greater than BF : again , because BE is equal B to CE , and

FE

than the third , BE , EF are greater than BF ; but AE is equal to EB ; therefore AE ,

EF , that is , AF , is А greater than BF : again , because BE is equal B to CE , and

FE

**common**to the triangles BEF , CEF , the two sides BE , EF are equal to the ... Side 89

the angles BCD , CDE by the straight lines CF , DF , and from the point F , in

which they meet , draw the straight lines FB , FA , FE ; therefore , since BC is

equal to CD , and CF

are ...

the angles BCD , CDE by the straight lines CF , DF , and from the point F , in

which they meet , draw the straight lines FB , FA , FE ; therefore , since BC is

equal to CD , and CF

**common**to the triangles BCF , DCF , the two sides BC , CF ,are ...

Side 129

for the same reason , DF is equal to FG : and because in the triangles DEF , GEF ,

DE is equal to EG , and EF

GE , EF , and the base DF is equal to the base GF : therefore the angle DEF is ...

for the same reason , DF is equal to FG : and because in the triangles DEF , GEF ,

DE is equal to EG , and EF

**common**, the two sides DE , EF are equal to the twoGE , EF , and the base DF is equal to the base GF : therefore the angle DEF is ...

Side 167

KL , MN are cut by the plane EBDX , the

16 . 11 . ) . For the same reason , because the two parallel planes GH , KL are cut

by H the plane AXFC , the

KL , MN are cut by the plane EBDX , the

**common**sections EX , BD , are parallel (16 . 11 . ) . For the same reason , because the two parallel planes GH , KL are cut

by H the plane AXFC , the

**common**G / A sections AC , XF , are parallel : and ...### Hva folk mener - Skriv en omtale

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### Vanlige uttrykk og setninger

added altitude angle ABC angle BAC base BC is given centre circle circle ABCD circumference common cone contained cylinder definition demonstrated described diameter divided double draw drawn equal equal angles equiangular equimultiples Euclid excess fore four fourth given angle given in magnitude given in position given in species given magnitude given ratio given straight line gles greater Greek half join less likewise magnitude manner meet multiple Note opposite parallel parallelogram pass perpendicular plane prism produced PROP proportionals proposition pyramid Q. E. D. PROP reason rectangle rectangle contained remaining right angles segment shown sides similar sine solid sphere square square of BC taken THEOR third triangle ABC wherefore whole

### Populære avsnitt

Side 36 - 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.

Side 145 - 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.

Side 65 - The angle in a semicircle is a right angle; the angle in a segment greater than a semicircle is less than a right angle; and the angle in a segment less than a semicircle is greater than a right angle.

Side 248 - 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.

Side 11 - If one side of a triangle be produced, the exterior angle is greater than either of the interior opposite angles.

Side 121 - 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.

Side 21 - 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.

Side 14 - To construct a triangle of which the sides shall be equal to three given straight lines ; but any two whatever of these lines must be greater than the third (20.

Side 80 - 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. either the sides adjacent to the equal...

Side 133 - ... rectilineal figures are to one another in the duplicate ratio of their homologous sides.