## Euclid's Elements [book 1-6] with corrections, by J.R. Young1838 |

### From inside the book

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**draw**a geometrical line , nor describe a geome- trical circle ; and the things which we call by these names are always supposed to be stripped of every physical circumstance , and instrumental imperfection ; and to be thus brought ... Page 12

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**draw**a straight line equal to a given straight line . Let A be the given point , and BC the given straight line ; it is required to**draw**from the point A a straight line equal to BC . # 1 Post . From the point A to B**draw*** the straight ... Page 13

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**drawn**equal to the given straight line BC . Which was to be done . The triangle DBA , employed in this problem , might ...**draw**the straight line AD equal to C ; and D A VE B F * 3 Post . from the centre A , and at the distance AD ... Page 19

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**draw**DE , and upon it describe an equilateral triangle DEF , so that F and A may be on opposite sides of DE ; then**draw**AF : the straight line AF shall bisect the angle BAC . Because AD is equalt to AE , and + Const . AF is common to ... Page 20

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**draw**a straight line from the point Cat right angles to AB . Take any point D in AC , make * CE equal to CD , * 3 . 1. upon DE describe * the equilateral triangle DFE , and * 1 . 1.**draw**CF. The straight line CF , + Const .**drawn**from ...### Other editions - View all

### Common terms and phrases

ABCD adjacent angles alternate angles angle ABC angle ACB angle BAC angle BCD angle EDF angles equal antecedent arc BC base BC BC is equal bisected centre circle ABC circumference consequent Const demonstrated described diameter double draw equal angles equal to AC equiangular equilateral and equiangular equimultiples Euclid exterior angle fore Geometry given circle given straight line gnomon greater inscribed join less Let ABC Let the straight logarithm multiple opposite angle parallel parallelogram pentagon perpendicular PROB proportion proposition Q. E. D. PROP radius rectangle contained rectilineal figure remaining angle segment side BC similar sine square of AC straight line AB straight line AC tangent THEOR touches the circle triangle ABC triangle DEF twice the rectangle wherefore

### Popular passages

Page 30 - IF two triangles have two sides of the one equal to two sides of the other, each to each, but the angle contained by the two sides of one of them greater than the angle contained by the two sides equal to them, of the other ; the base of that which has the greater angle shall be greater than the base of the other.

Page 105 - 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.

Page 50 - 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 61 - 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 on the line between the points of section, is equal to the square on half the line.

Page 65 - If a straight line be divided into any two parts, four times the rectangle contained by the whole line and one of the parts, together with the square of the other part, is equal to the square of the straight line which is made up of the whole and that part.

Page 70 - 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.

Page 41 - 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 172 - 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 45 - TRIANGLES upon the same base, and between the same parallels, are equal to one another.

Page 38 - 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.