## The Elements of Geometry, Symbolically Arranged |

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Side 89

... then 6 is said to be a mean

rectilineal figures are those which have their respective angles equal to each

other , and the sides about the equal angles

16 .

... then 6 is said to be a mean

**proportional**between a and b . DEF . 3 . - Similarrectilineal figures are those which have their respective angles equal to each

other , and the sides about the equal angles

**proportional**. PROP . LXV . THEOR .16 .

Side 98

The perpendicular AD is a mean

the base BC . And each of the sides AB , AC , is a mean

base BC and the segment adjacent to the side . For in the Prop . 73 . As , BDA ...

The perpendicular AD is a mean

**proportional**between the segments BD , DC , ofthe base BC . And each of the sides AB , AC , is a mean

**proportional**between thebase BC and the segment adjacent to the side . For in the Prop . 73 . As , BDA ...

Side 106

Let ABCDE , FGHIK be any two similar figures , having the Zs A , B , C , & c . , of

the one figure respectively equal to the Ls F , G , H , & c . , of the other , and the

sides about the equal Zs

sides ...

Let ABCDE , FGHIK be any two similar figures , having the Zs A , B , C , & c . , of

the one figure respectively equal to the Ls F , G , H , & c . , of the other , and the

sides about the equal Zs

**proportional**; also let AB and FG be correspondingsides ...

Side 115

... half the hypothenuse , 58 . Divide a given straight line in the same proportion

as another given divided line . 59 . Find a fourth

straight lines . 60 . Find a mean

EXERCISES .

... half the hypothenuse , 58 . Divide a given straight line in the same proportion

as another given divided line . 59 . Find a fourth

**proportional**to three givenstraight lines . 60 . Find a mean

**proportional**between two given straightEXERCISES .

Side 116

Find a mean

by a line drawn parallel to one of its sides . 62 . The sum of the perpendiculars

drawn from any point within an equilateral triangle to the sides , is equal to the ...

Find a mean

**proportional**between two given straight lines . 61 . Bisect a triangleby a line drawn parallel to one of its sides . 62 . The sum of the perpendiculars

drawn from any point within an equilateral triangle to the sides , is equal to the ...

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The Elements of Geometry, Symbolically Arranged Great Britain. Admiralty Uten tilgangsbegrensning - 1846 |

The Elements of Geometry, Symbolically Arranged Great Britain Admiralty Ingen forhåndsvisning tilgjengelig - 2016 |

### Vanlige uttrykk og setninger

_ ABC ABCD angle contained base base BC bisect called centre circle circumference coincides common Constr descr described diam diameter dist divided draw equal equal angles equiangular equilat expressed extremities falls figure given point given straight line gnomon greater half interior isosceles join less Let ABC line drawn manner mean meet oppo opposite angle opposite sides parallel parallelogram pass perpendicular plane polygon PROB prod produced Prop proportional proposition proved quantities ratio rect rectangle contained rectilineal remain right angles segments shown sides square THEOR touch triangle unequal Wherefore whole

### Populære avsnitt

Side 58 - 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 32 - 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 60 - If a straight line be bisected and produced to any point, the rectangle contained by the whole line thus produced and the part of it produced, together with the square of...

Side 36 - Wherefore, if a straight line, &c. QB D. PROPOSITION XXVIII. THEOB.—-If a straight line, falling upon two other straight lines, make the exterior angle equal to...

Side 61 - 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 21 - If, at a point in a straight line, two other straight lines, upon the opposite sides of it, make the adjacent angles together equal to two right angles, these two straight lines shall be in one and the same straight line.

Side 37 - IF a straight line fall upon two parallel straight lines, it makes the alternate angles equal to one another; and the exterior angle equal to the interior and opposite upon the same side; and likewise the two interior angles upon the same side together equal to two right angles...

Side 3 - A circle is a plane figure contained by one line, which is called the circumference, and is such that all straight lines drawn from a certain point within the figure to the circumference, are equal to one another : XVI.

Side 77 - If a straight line touch a circle, and from the point of contact a straight line be drawn cutting the circle, the angles which this line makes with the line touching the circle, shall be equal to the angles which are in the alternate segments of the circle.

Side 19 - To draw a straight line perpendicular to a given straight line of an unlimited length, from a given point without it.