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 ... (Google eブックス)
Robert Heward, 1833 - 150 ページ
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ABCD adjacent angles alternate angles angle ABC angle ACB angle BAC angular points arej equal assigned point Axiom axis base BC bisected called CEGDHF central distances change of place circle coincide throughout Constr demonstrated double equal straight lines equal to AC equilateral triangle Euclid exterior angle extremities four right angles Geometry given straight line greater hard body inclose a space instance Interc Intercalary Book isf equal join line AC magnitude manner meet MQOP 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
51 ページ - 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.
111 ページ - Parallelograms upon the same base and between the same parallels, are equal to one another.
120 ページ - 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.
72 ページ - Any two sides of a triangle are together greater than the third side.
55 ページ - 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.
70 ページ - Any two angles of a triangle are together less than two right angles.
138 ページ - ... 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.