## Elements of Geometry: Containing the First Six Books of Euclid : with a Supplement on the Quadrature of the Circle, and the Geometry of Solids : to which are Added Elements of Plane and Spherical Trigonometry |

### Inni boken

Resultat 1-5 av 91

Side 11

Parallel straight lines are such as are in the same plane , and which , being

Parallel straight lines are such as are in the same plane , and which , being

**produced**ever so far both ways , do not meet . POSTULATES . 1. Let it be granted that a straight line may be drawn from any one point to any other point . 2. Side 12

the equilateral triangle DAB , and

the equilateral triangle DAB , and

**produce**( 2. Post . ) the straight lines DA , H BD , to E and F ; from the centre B , at the distance BC , describe ( 3. Post . ) the circle D Ꭰ CGH , and from the centre D , at the distance DG ... Side 14

The angles at the base of an Isosceles triangle are equal to one another ; and if the equal sides be

The angles at the base of an Isosceles triangle are equal to one another ; and if the equal sides be

**produced**, the angles upon the other side of the base shall be equal . Let ABC be an isosceles triangle , of which the side AB is equal ... Side 16

But if one of the vertices , as D , , E be within the other triangle ACB ;

But if one of the vertices , as D , , E be within the other triangle ACB ;

**produce**AC , AD to E , F ; therefore , because AC is equal to AD in the triangle ACD , the angles ECD , FDC D upon the other side of the base CD are equal ( 5. Side 18

А To draw a straight line perpendicular to a given straight line , of an unlimited length , from a given point without it Let AB be a given straight line , which may be

А To draw a straight line perpendicular to a given straight line , of an unlimited length , from a given point without it Let AB be a given straight line , which may be

**produced**to any length both ways , and let C be a point without it ...### Hva folk mener - Skriv en omtale

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Elements of Geometry: Containing the First Six Books of Euclid, with a ... John Playfair Uten tilgangsbegrensning - 1836 |

Elements of Geometry: Containing the First Six Books of Euclid with a ... John Playfair Uten tilgangsbegrensning - 1855 |

Elements of Geometry: Containing the First Six Books of Euclid, with a ... John Playfair Uten tilgangsbegrensning - 1847 |

### Vanlige uttrykk og setninger

ABCD altitude angle ABC angle BAC base bisected Book called centre chord circle circle ABC circumference coincide common consequently construction cylinder definition demonstrated described diameter difference divided double draw drawn equal equal angles equiangular equilateral Euclid exterior angle extremity fall fore four fourth given given straight line greater half Hence inscribed interior join less Let ABC magnitudes manner meet multiple opposite parallel parallelogram pass perpendicular plane polygon prism PROB produced PROP proportional proposition proved radius ratio reason rectangle contained rectilineal figure remaining right angles segment shewn sides similar sine solid square straight line taken tangent THEOR third touch triangle ABC wherefore whole

### Populære avsnitt

Side 51 - If a straight line be divided into two equal parts, and also into two unequal parts; the rectangle contained by the unequal parts, together with the square of the line between the points of section, is equal to the square of half the line.

Side 12 - AB; but things which are equal to the same are equal to one another...

Side 80 - 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 288 - 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 35 - Parallelograms upon the same base and between the same parallels, are equal to one another.

Side 81 - If a straight line touch a circle, and from the point of contact a straight line be drawn cutting the circle, the angles made by this line with the line which touches the circle, shall be equal to the angles in the alternate segments of the circle.

Side 52 - 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 in the point C ; the squares of AB, BC are equal to twice the rectangle AB, BC, together with the square of AC.

Side 127 - 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 23 - If, from the ends of the side of a triangle, there be drawn two straight lines to a point within the triangle, these shall be less than, the other two sides of the triangle, but shall contain a greater angle.

Side 19 - The angles which one straight line makes with another upon one side of it, are either two right angles, or are together equal to two right angles. Let the straight line AB make with CD, upon one side of it the angles CBA, ABD ; these are either two right angles, or are together equal to two right angles. For, if the angle CBA be equal to ABD, each of them is a right angle (Def.