## 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 42

Side 15

Hence every equilateral triangle is also

Hence every equilateral triangle is also

**equiangular**. PROP . VI . THEOR . 1 If two angles of a triangle be equal to one another , the sides which subtend , or are opposite to them , are also equal to one another . Side 31

is also

is also

**equiangular**, each of its angles will be equal to the third part of two right angles ; so that if the right angle is expressed by unity , the angle of an equilateral triangle will be expressed by of one right angle . Cor . 8. Side 32

... is a parallelogram , or has its opposite sides parallel . For , having drawn the diagonal BC ; then , the triangles ABC , CBD , being mutually equilateral ( hyp . ) , they are also mutually

... is a parallelogram , or has its opposite sides parallel . For , having drawn the diagonal BC ; then , the triangles ABC , CBD , being mutually equilateral ( hyp . ) , they are also mutually

**equiangular**( Th . 8. ) ... Side 92

A polygon , which is at once equilateral and

A polygon , which is at once equilateral and

**equiangular**, is called a regular polygon . Regular polygons may have any number of sides ; the equilateral triangle is one of three sides ; and the square is one of four sides . LEMMA . Side 93

the chords AB , BC , CD , & c . will also be equal ; hence , likewise , the triangles ABG , BGC , CGD , & c . must be equal , because they are

the chords AB , BC , CD , & c . will also be equal ; hence , likewise , the triangles ABG , BGC , CGD , & c . must be equal , because they are

**equiangular**; hence all the angles ABC , BCD , CDE ...### 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 - 1842 |

Elements of Geometry: Containing the First Six Books of Euclid, with a ... John Playfair Uten tilgangsbegrensning - 1840 |

### 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.