## The Elements of Euclid |

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Resultat 1-5 av 10

Side 55

the

in the point F : it cuts it also at right angles . Take ( 1 . 3 . ) E the

, and join EA , EB . Then , because AF is equal to FB , and FE common to the ...

the

**centre**, bisect any straight line AB , which does not pass through the**centre**,in the point F : it cuts it also at right angles . Take ( 1 . 3 . ) E the

**centre**of the circle, and join EA , EB . Then , because AF is equal to FB , and FE common to the ...

Side 56

If two circles cut one another , they shall not have the same

two circles ABC , CDG cut one another in the points B , C ; they have not the

same

If two circles cut one another , they shall not have the same

**centre**. uaw C Let thetwo circles ABC , CDG cut one another in the points B , C ; they have not the

same

**centre**. For , if it be possible , let E be their**centre**: join EC , and draw any ... Side 57

others , that which is nearer to the line which passes through the

greater than one more remote ; and from the same point there can be drawn only

two straight lines that are equal to one another , one upon each side of the ...

others , that which is nearer to the line which passes through the

**centre**is alwaysgreater than one more remote ; and from the same point there can be drawn only

two straight lines that are equal to one another , one upon each side of the ...

Side 59

If a point be taken within a circle , from which there fall more than two equal

straight lines to the circumference , that point is the

point D be taken within the circle ABC , from which to the circumference there fall

more ...

If a point be taken within a circle , from which there fall more than two equal

straight lines to the circumference , that point is the

**centre**of the circle . Let thepoint D be taken within the circle ABC , from which to the circumference there fall

more ...

Side 62

B Let the straight lines AB , CD , in the circle ABDC , be equal to one another :

they are equally distant from the

and from it draw EF , EG perpendiculars to AB , CD ; then , because the straight

line ...

B Let the straight lines AB , CD , in the circle ABDC , be equal to one another :

they are equally distant from the

**centre**. Take E the**centre**of the circle ABDC ,and from it draw EF , EG perpendiculars to AB , CD ; then , because the straight

line ...

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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.