## The Elements of Euclid |

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Side 40

If there be two straight lines , one of which is

the rectangle contained by the two straight lines , is equal to the rectangles

contained by the undivided line , and the several parts of the

and BC ...

If there be two straight lines , one of which is

**divided**into any number of parts ;the rectangle contained by the two straight lines , is equal to the rectangles

contained by the undivided line , and the several parts of the

**divided**line . Let Aand BC ...

Side 41

If a straight line be

whole and each of the parts , are together equal to the square of the whole line .

Let the straight line AB be

If a straight line be

**divided**into any two parts , the rectangles contained by thewhole and each of the parts , are together equal to the square of the whole line .

Let the straight line AB be

**divided**into any A C B two parts in the point C ; the ... Side 133

To

into parts that shall have the same ratios to one another which the parts of the

and ...

To

**divide**a given straight line similarly to a given**divided**straight line , that is ,into parts that shall have the same ratios to one another which the parts of the

**divided**given straight line have . Let AB be the straight line given to be**divided**,and ...

Side 206

If there be two pyramids of the same altitude , upon triangular bases , and each of

them be

into two equal prisms ; and if each of these pyramids be

If there be two pyramids of the same altitude , upon triangular bases , and each of

them be

**divided**into two equal pyramids similar to the whole pyramid , and alsointo two equal prisms ; and if each of these pyramids be

**divided**in the same ... Side 248

This proposition is

construction and demonstration ; therefore it is now

DO PROP . XXXIII . B . III . This also in the Greek is

which ...

This proposition is

**divided**into three cases , of which two have the sameconstruction and demonstration ; therefore it is now

**divided**only into two cases . .DO PROP . XXXIII . B . III . This also in the Greek is

**divided**into three cases , ofwhich ...

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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.