Geometry Without Axioms; Or the First Book of Euclid's Elements. With Alterations and Familiar Notes; and an Intercalary Book in which the Straight Line and Plane are Derived from Properties of the Sphere ...: To which is Added an Appendix ... |
From inside the book
Results 1-5 of 11
Page 81
... alternate angles equal to one another , those two straight lines being prolonged ever so far both ways , shall not meet . First Case ; where the two straight lines are both in the same plane . Let the straight line EF , falling upon the ...
... alternate angles equal to one another , those two straight lines being prolonged ever so far both ways , shall not meet . First Case ; where the two straight lines are both in the same plane . Let the straight line EF , falling upon the ...
Page 82
... alternate angles taken to be equal . Second Case ; if the two straight lines are not in the same plane , they can never meet though prolonged ever so far both ways , whether the alternate angles they make with the other straight line ...
... alternate angles taken to be equal . Second Case ; if the two straight lines are not in the same plane , they can never meet though prolonged ever so far both ways , whether the alternate angles they make with the other straight line ...
Page 83
... alternate angles ; therefore ( by Cor . 1 above ) AB and CD are parallel . * Hyp . + I. 12 . Secondly ; where HGB and GHD the interior angles on the same side of the line , are together equal to two right angles . Because the angles HGB ...
... alternate angles ; therefore ( by Cor . 1 above ) AB and CD are parallel . * Hyp . + I. 12 . Secondly ; where HGB and GHD the interior angles on the same side of the line , are together equal to two right angles . Because the angles HGB ...
Page 84
... alternate + Constr . angles EAD and ADC are † equal to one another , EF and BC are ‡ + 1.27.Cor.1 . parallel . Therefore through the point A is drawn a straight line EAF , parallel to BC . Which was to be done . And by parity of ...
... alternate + Constr . angles EAD and ADC are † equal to one another , EF and BC are ‡ + 1.27.Cor.1 . parallel . Therefore through the point A is drawn a straight line EAF , parallel to BC . Which was to be done . And by parity of ...
Page 86
... alternate angles ; therefore DC and AB are † parallel . * I. 11 . I. 11 . Z D F C W G H X K I E B COR . 2. If through any point in EF as G , a straight line of unlimited length both ways ( as WX ) be drawn at right angles to EF ; it ...
... alternate angles ; therefore DC and AB are † parallel . * I. 11 . I. 11 . Z D F C W G H X K I E B COR . 2. If through any point in EF as G , a straight line of unlimited length both ways ( as WX ) be drawn at right angles to EF ; it ...
Other editions - View all
Geometry Without Axioms; Or the First Book of Euclid's Elements. with ... Thomas Perronet Thompson No preview available - 2015 |
Common terms and phrases
ABCD adjacent angles alternate angles angle ABC angle ACB angle BAC angular points assigned point Axiom axis base BC bisected called CEGDHF central distances change of place circle coincide throughout Constr demonstrated double equal angles equal straight lines equal to AC equal to EF equilateral triangle Euclid exterior angle extremities four right angles Geometry given straight line greater half the angle hard body inclose a space instance INTERC Intercalary Book ist equal join line AC magnitude manner meet opposite angles parallelogram parity of reasoning pass perpendicular prolonged Prop PROPOSITION proved quadrilateral radii radius rectilinear figure remain unmoved remaining angle remains at rest respectively SCHOLIUM self-rejoining line shown side BC side opposite situation sphere whose centre straight line BC tessera THEOREM.-If third side triangle ABC turned unlimited length Wherefore
Popular passages
Page 51 - 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 109 - PARALLELOGRAMS upon the same base, and between the same parallels, are equal to one another...
Page 111 - Parallelograms upon the same base and between the same parallels, are equal to one another.
Page 120 - If the square described on one of the sides of a triangle be equal to the squares described on the other two sides of it, the angle contained by these two sides is a right angle.
Page 72 - Any two sides of a triangle are together greater than the third side.
Page 55 - From the greater of two given straight lines to cut off a part equal to the less. Let AB and C be the two given straight lines, whereof AB is the greater.
Page 103 - ... twice as many right angles as the figure has sides.
Page 70 - Any two angles of a triangle are together less than two right angles.
Page 138 - ... the exterior angle equal to the interior and opposite on the same side of the line ; and likewise the two interior angles on the same side of the line together equal to two right angles.
Page 106 - THE straight lines which join the extremities of two equal and parallel straight lines, towards the same parts, are also themselves equal and parallel.