## The Elements of Euclid |

### Inni boken

Resultat 1-5 av 11

Side 11

the circle DEF ; and because A is the centre of the circle DEF , AE shall be equal

to AD ; but the straight line C is

of them equal to AD ; wherefore the straight line AE is equal to ( 1 . Ax . ) C , and ...

the circle DEF ; and because A is the centre of the circle DEF , AE shall be equal

to AD ; but the straight line C is

**likewise**equal to AD ; whence AE and C are eachof them equal to AD ; wherefore the straight line AE is equal to ( 1 . Ax . ) C , and ...

Side 14

to one another , but the angle ECD is greater than the angle BCD ; wherefore the

angle FDC is

greater than the angle BCD . Again because CB is equal to DB , the angle BDC is

...

to one another , but the angle ECD is greater than the angle BCD ; wherefore the

angle FDC is

**likewise**greater than BCD ; much more then is the angle BDCgreater than the angle BCD . Again because CB is equal to DB , the angle BDC is

...

Side 34

parallel to EF : therefore AF G FECG is a parallelogram : and because BE is

equal to EC , the triangle ABE is

since they are upon equal bases BE , EC and between the same parallels BC ,

AG ...

parallel to EF : therefore AF G FECG is a parallelogram : and because BE is

equal to EC , the triangle ABE is

**likewise**equal ( 38 . 1 . ) to the triangle AEC ,since they are upon equal bases BE , EC and between the same parallels BC ,

AG ...

Side 112

In like manner it may be demonstrated , that if GH be equal to KX , LN

equal to NP ; and if less , less : and GH , LM are any equimultiples whatever of

AE , CF , and KX , NP are any whatever of EB , FD . Therefore ( 5 . def . 5 . ) , as

AE ...

In like manner it may be demonstrated , that if GH be equal to KX , LN

**likewise**isequal to NP ; and if less , less : and GH , LM are any equimultiples whatever of

AE , CF , and KX , NP are any whatever of EB , FD . Therefore ( 5 . def . 5 . ) , as

AE ...

Side 113

... of AE , CF : and because KO , NP are equimultiples of BE , DF , if G CL from KO

, NP there be taken KH , NM , which are

remainders HO , MP are either equal to BE , DF , or equimultiples of them ( 6 . 5 .

) ...

... of AE , CF : and because KO , NP are equimultiples of BE , DF , if G CL from KO

, NP there be taken KH , NM , which are

**likewise**equimultiples of BE , DF , theremainders HO , MP are either equal to BE , DF , or equimultiples of them ( 6 . 5 .

) ...

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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.