## The First Six Books with Notes |

### From inside the book

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Page 1

The

The

**extremities**of a line are points . 4. A right line is that which lies evenly between its Plate I. extreme points . Fig . ) 5. A surface is that which hath only length and breadth . 6. The**extremities**of a surface are lines . 7. Page 4

CB to the

CB to the

**extremities**of the given right line ( 2 ) . It is evident that ACB is a triangle ... 13 F From the given point A draw a right line AB to ( 1 ) Post . l . either**extremity**B of the given line ( 1 ) . Upon AB ( 2 ) Prop . Page 5

The position of the right line AL varies according to the

The position of the right line AL varies according to the

**extremity**of the given right line from which it is drawn , and also according to the side of that line on which the triangle is constructed . 14 D PROP . III . PROB . Page 10

In the same manner a perpendicular can be erected at one

In the same manner a perpendicular can be erected at one

**extremity**of a given line , by first producing the line . 2,5 D B PROP . XII . PROB . X Fig . 25 . See N. To draw a perpendicular to a given indefinite right line ( AB ) from a ... Page 14

Two right lines ( DB and DC ) di awon to a point ( D ) within a triangle ( BAC ) from the

Two right lines ( DB and DC ) di awon to a point ( D ) within a triangle ( BAC ) from the

**extremities**of any side ( BC ) , are together less than the sum of the two other sides of the triangle ( AB and Ac ) , but contain a greater angle ...### What people are saying - Write a review

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### Common terms and phrases

absurd added alternate angles angle ABC applied arches base bisected centre circle circumference common Constr constructed contained contained in CD continued definition demonstrated described difference divided draw drawn equal equal angles equi-multiples equi-submultiples equiangular equilateral Euclid evident external extremities fall figure fore four magnitudes fourth given line given right line greater half Hence Hypoth inscribed internal join less line AC manner meet multiple oftener parallel parallelogram pass perpendicular placed possible PROB produced Prop proportional proposition proved radius ratio rectangle rectilineal figure remaining right angles right line ruler Schol segment side AC similar squares of AC submultiple taken tangent THEOR third triangle ABC vertex whole

### Popular passages

Page 145 - A plane rectilineal angle is the inclination of two straight lines to one another, which meet together, but are not in the same straight line.

Page 2 - 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 : 16.

Page 28 - To a given straight line to apply a parallelogram, which shall be equal to a given triangle, and have one of its angles equal to a given rectilineal angle.

Page 22 - 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.

Page 118 - A straight line is said to be cut in extreme and mean ratio, when the whole is to the greater segment as the greater segment is to the less.

Page 146 - A plane angle is the inclination of two lines to one another in a plane, which meet together, but are not in the same direction.

Page 168 - The first of four magnitudes is said to have the same ratio to the second, which the third has to the fourth, when any equimultiples whatsoever of the first and third being taken, and any equimultiples whatsoever of the second and fourth ; if the multiple of the first be less than that of the second, the multiple of the third is also less than that of the fourth...

Page 3 - Things which are equal to the same thing are also equal to one another. 2. If equals be added to equals, the wholes are equal. 3. If equals be subtracted from equals, the remainders are equal. 4. Things which coincide with one another are equal to one another.

Page 25 - DE : but equal triangles on the same base and on the same side of it, are between the same parallels ; (i.

Page 3 - A rhombus is that which has all its sides equal, but its angles are not right angles.