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 74
Page ix
... triangle are not less than two right angles ; and Euclid's Axiom . The formula of generalization ( see p . 5 ) has been extended and rigidly adhered to , for the express purpose of protesting against the unfortunate use which has been ...
... triangle are not less than two right angles ; and Euclid's Axiom . The formula of generalization ( see p . 5 ) has been extended and rigidly adhered to , for the express purpose of protesting against the unfortunate use which has been ...
Page 5
... triangle are less than right angles , the other is necessarily greater than a right angle . The negative is , that if one angle of a triangle is not greater than a right angle , the other two are not less than right angles . The ...
... triangle are less than right angles , the other is necessarily greater than a right angle . The negative is , that if one angle of a triangle is not greater than a right angle , the other two are not less than right angles . The ...
Page 51
... triangles . XLIV . Those contained by four straight lines , are called quad- rilateral . XLV . Those contained by more than four , are called polygons . Figures in which a number of sides is specified or intimated , are always ...
... triangles . XLIV . Those contained by four straight lines , are called quad- rilateral . XLV . Those contained by more than four , are called polygons . Figures in which a number of sides is specified or intimated , are always ...
Page 52
... triangles , such as have two sides equal , are called isoskeles . XLVII . A triangle which has all its three sides equal , is called equilateral . Hence all equilateral triangles are at the same time isoskeles ; but isoskeles triangles ...
... triangles , such as have two sides equal , are called isoskeles . XLVII . A triangle which has all its three sides equal , is called equilateral . Hence all equilateral triangles are at the same time isoskeles ; but isoskeles triangles ...
Page 53
... triangle upon a given straight line . * INTERC.13 . Cor . 3 . Let AB be the given straight line . It is required to describe an equilateral triangle upon it . About the centre A , with the radius AB , de- scribe * the circle BCD ; and ...
... triangle upon a given straight line . * INTERC.13 . Cor . 3 . Let AB be the given straight line . It is required to describe an equilateral triangle upon it . About the centre A , with the radius AB , de- scribe * the circle BCD ; and ...
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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.