## The First Six Books: Together with the Eleventh and Twelfth |

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Page 17

AB to DE , and AC to DF ; Book 1 . and the angle BAC equal A D to the angle EDF , the base BC shall be equal to the base EF ; and the

AB to DE , and AC to DF ; Book 1 . and the angle BAC equal A D to the angle EDF , the base BC shall be equal to the base EF ; and the

**triangle ABC**to the triangle DEF ; and the other angles , to which the equal Sdes are opposite , shall ... Page 18

G Book I. qual to AC , and let the straight lines AB , AC be produced to D and E , the

G Book I. qual to AC , and let the straight lines AB , AC be produced to D and E , the

**angle ABC**shall be equal to the angle ACB , and the angle CBD to the angle BCE . In BD take any point F , and from AE , the greater , cut off a 3. Page 19

Let ABC be a triangle having the

Let ABC be a triangle having the

**angle ABC**equal to the Book 1 . angle ACB ; the fide AB is also equal to the side AC . For , if AB be not equal to AC , one of them is greater than the other : Let AB be the greater , and from it cut off ... Page 20

Let

Let

**ABC**, DEF be two triangles having the two sides AB , AC equal to the two sides DE , DF , each to each , viz . AB to DE , and AC to A D G DF , and also the bare BC equal to the base EF . The**angle**BAC is e . qual to the**angle**EDF . Page 24

Let the straight line AB make with CD , upon one lide of it , the angles CBA , ABD ; these are either two right angles , or are ... Again , because the angle DBA is equal to the two angles DBE , EBA , add to these equals the

Let the straight line AB make with CD , upon one lide of it , the angles CBA , ABD ; these are either two right angles , or are ... Again , because the angle DBA is equal to the two angles DBE , EBA , add to these equals the

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### Common terms and phrases

added alſo altitude angle ABC angle BAC baſe becauſe Book caſe centre circle circle ABCD circumference common cone cylinder definition demonſtrated deſcribed diameter divided double draw drawn equal equal angles equiangular equimultiples exceſs fame fides figure firſt folid fore four fourth given angle given in poſition given in ſpecies given magnitude given ratio given ſtraight line greater Greek half join leſs likewiſe magnitude manner meet muſt oppoſite parallel parallelogram perpendicular plane priſm produced prop proportionals propoſition pyramid reaſon rectangle rectangle contained rectilineal remaining right angles ſame ſecond ſegment ſhall ſides ſimilar ſolid ſphere ſquare ſquare of AC Take taken theſe third triangle ABC wherefore whole

### Popular passages

Page 483 - The circumference of every circle is supposed to be divided into 360 equal parts, called degrees ; and each degree into 60 equal parts, called minutes ; and each minute into 60 equal parts, called seconds ; and these into thirds, &c.

Page 170 - 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.

Page 81 - THE straight line drawn at right angles to the diameter of a circle, from the extremity of...

Page 105 - DEF are likewise equal (13. i.) to two right angles ; therefore the angles AKB, AMB are equal to the angles DEG, DEF, of which AKB is equal to DEG ; wherefore the remaining angle AMB is equal to the remaining angle DEF.

Page 167 - AC the same multiple of AD, that AB is of the part which is to be cut off from it : join BC, and draw DE parallel to it : then AE is the part required to be cut off.

Page 10 - When a straight line standing on another straight line makes the adjacent angles equal to one another, each of the angles is called a right angle; and the straight line which stands on the other is called a perpendicular to it.

Page 62 - AB be the given straight line ; it is required to divide it into two parts, so that the rectangle contained by the whole, and one of the parts, shall be equal to the square of the other part.

Page 112 - To describe an equilateral and equiangular pentagon about a given circle. • Let ABCDE be the given circle; it is required to describe an equilateral and equiangular pentagon about the circle ABCDE. Let the angles of a pentagon, inscribed in the circle...

Page 200 - 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...

Page 38 - F, which is the common vertex of the triangles ; that is, together with four right angles. 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.