## The Elements of Euclid |

### Inni boken

Resultat 1-5 av 17

Side 89

Let ABCDE be the

inscribe a circle in the pentagon ABCDE . Bisect ( 9 . 1 . ) the angles BCD , CDE

by the

...

Let ABCDE be the

**given**equilateral and equiangular pentagon : it is required toinscribe a circle in the pentagon ABCDE . Bisect ( 9 . 1 . ) the angles BCD , CDE

by the

**straight lines**CF , DF , and from the point F , in which they meet , draw the...

Side 179

At a given point in a

solid angle contained by three plane angles . * Let AB be a

a given point in it , and Da given solid angle contained by the three plane angles

...

At a given point in a

**given straight line**, to make a solid angle equal to a givensolid angle contained by three plane angles . * Let AB be a

**given straight line**, Aa given point in it , and Da given solid angle contained by the three plane angles

...

Side 225

Let ABCD , EFGH be two

inscribe in the greater circle ABCD a polygon of an even number of equal sides ,

that shall not meet the lesser circle . Through the centre K draw the

Let ABCD , EFGH be two

**given**circles having the same centre K : it is required toinscribe in the greater circle ABCD a polygon of an even number of equal sides ,

that shall not meet the lesser circle . Through the centre K draw the

**straight line**... Side 238

The boundary of a line is called a point , or a point is the common boundary or

extremity of two lines H GM that are ... one is

superficies , which is manifestly supposed in the Elements , viz . that a

The boundary of a line is called a point , or a point is the common boundary or

extremity of two lines H GM that are ... one is

**given**from a property of a planesuperficies , which is manifestly supposed in the Elements , viz . that a

**straight****line**... Side 241

... that he may supply the omission he blames Euclid for ; which determination is II

that any of the three

great deal to do , both to ancient and modern geometers : it seems not to be ...

... that he may supply the omission he blames Euclid for ; which determination is II

that any of the three

**straight lines**DM ... on which this 29th depends , has**given**agreat deal to do , both to ancient and modern geometers : it seems not to be ...

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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.