## The Elements of Euclid; viz. the first six books, together with the eleventh and twelfth. Also the book of Euclid's Data. By R. Simson. To which is added, A treatise on the construction of the trigonometrical canon [by J. Christison] and A concise account of logarithms [by A. Robertson]. |

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Resultat 1-5 av 6

Side 188

A straight line is perpendicular , or at right angles , to a

right angles with every straight line meeting it in that ... A

to a

the ...

A straight line is perpendicular , or at right angles , to a

**plane**, when it makesright angles with every straight line meeting it in that ... A

**plane**is perpendicularto a

**plane**, when the straight lines ! drawn in one of the**planes**perpendicularly tothe ...

Side 191

One part of a straight line cannot be in a

. If it be possible , let AB , part of the straight line ABC , be in the

part BC above it : And since the straight line AB is in the

One part of a straight line cannot be in a

**plane**, See N . and another part above it. If it be possible , let AB , part of the straight line ABC , be in the

**plane**, and thepart BC above it : And since the straight line AB is in the

**plane**, it can be ... Side 199

AF ; and consequently AF is ... to each of two straight lines in the point of their

intersection , it shall also be at right angles to the

**plane**through ED , AD , meets it : Therefore GH is per - Boox XL , pendicular toAF ; and consequently AF is ... to each of two straight lines in the point of their

intersection , it shall also be at right angles to the

**plane**passing through them . Side 203

For the same reason , be - Boox XI . cause the two parallel

KL are cut by the

because EX is parallel to BD , a side of the triangle ABD ; 12 . 6 . as AE to EB ...

For the same reason , be - Boox XI . cause the two parallel

**planes**a 16 . 11 . GH ,KL are cut by the

**plane**I AXFC , the common sections AC , XF are parallel : Andbecause EX is parallel to BD , a side of the triangle ABD ; 12 . 6 . as AE to EB ...

Side 204

1 Book XI . their common section , are also at right angles to the other planed ;

and any straight line FG in the

conimon section of the

1 Book XI . their common section , are also at right angles to the other planed ;

and any straight line FG in the

**plane**DE , which is at right angles to CE theconimon section of the

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The Elements of Euclid; viz. the first six books, together with the eleventh ... Euclides Uten tilgangsbegrensning - 1834 |

### Vanlige uttrykk og setninger

added altitude angle ABC angle BAC base Book centre circle circle ABCD circumference common cone contained cylinder definition demonstrated described diameter difference divided double draw drawn equal equal angles equiangular equimultiples excess figure fore four fourth given angle given in position given in species given magnitude given ratio given straight line greater Greek half join less likewise logarithm magnitude manner meet multiple opposite parallel parallelogram pass perpendicular plane prism produced PROP proportionals proposition pyramid radius reason rectangle rectangle contained remaining right angles segment shown sides similar sine solid solid angle sphere square square of AC Take taken THEOR third triangle ABC wherefore whole

### Populære avsnitt

Side 43 - IF a straight line be divided into any two parts, the square of the whole line is equal to the squares of the two parts, together with twice the rectangle contained by the parts.

Side 20 - Any two sides of a triangle are together greater than the third side.

Side 30 - Therefore all the angles of the figure, together with four right angles, are equal to twice as many right angles as the figure has sides.

Side 20 - 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. Let...

Side 306 - 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 8 - DL is equal to DG, and DA, DB, parts of them, are equal ; therefore the remainder AL is equal to the remainder (3. Ax.) BG : But it has been shewn that BC is equal to BG ; wherefore AL and BC are each of them equal to BG ; and things that are equal to the same are equal to one another ; therefore the straight line AL is equal to BC.

Side 153 - 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 52 - To divide a given straight line into two parts, so that the rectangle contained by the whole, and one of the parts, may be equal to the square of the other part.

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.

Side 165 - SIMILAR triangles are to one another in the duplicate ratio of their homologous sides.