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
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Page 51
... angles is called a right angle . And the straight line which stands on the other is called a perpendicular to it ... four straight lines , are called quad- rilateral . XLV . Those contained by more than four , are called polygons ...
... angles is called a right angle . And the straight line which stands on the other is called a perpendicular to it ... four straight lines , are called quad- rilateral . XLV . Those contained by more than four , are called polygons ...
Page 65
... angles , however many , on the one side of a straight line , at the same point and in the same plane , are together equal to two right ... four right angles . For if any one of the straight lines be prolonged on the other side of the angular ...
... angles , however many , on the one side of a straight line , at the same point and in the same plane , are together equal to two right ... four right angles . For if any one of the straight lines be prolonged on the other side of the angular ...
Page 66
... right angles , is not in the same straight line with it . For let BD , BE be two straight lines making an angle DBE ... four right angles , and the angle on one side of BD and BE is greater than two right angles , the angle on the other ...
... right angles , is not in the same straight line with it . For let BD , BE be two straight lines making an angle DBE ... four right angles , and the angle on one side of BD and BE is greater than two right angles , the angle on the other ...
Page 76
... angles CDB and FDB are either greater or less than right angles , and all the angles at the point D aret together equal to four right angles ; DC and DF make an angle less than two right angles , either on one side or the other ...
... angles CDB and FDB are either greater or less than right angles , and all the angles at the point D aret together equal to four right angles ; DC and DF make an angle less than two right angles , either on one side or the other ...
Page 102
... 4 . PROPOSITION XXXII . THEOREM . - The three interior angles of every triangle are equal to two right angles . Let ABC be a triangle . The three interior angles CAB , ABC , and BCA , are together equal to two right angles . Prolong ...
... 4 . PROPOSITION XXXII . THEOREM . - The three interior angles of every triangle are equal to two right angles . Let ABC be a triangle . The three interior angles CAB , ABC , and BCA , are together equal to two right angles . Prolong ...
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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.