Books 3-9The University Press, 1908 |
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Αποτελέσματα 1 - 5 από τα 88.
Σελίδα 1
... centre when the perpendiculars drawn to them from the centre are equal . 5. And that straight line is said to be at a greater distance on which the greater perpendicular falls . 6. A segment of a circle is the figure contained by a ...
... centre when the perpendiculars drawn to them from the centre are equal . 5. And that straight line is said to be at a greater distance on which the greater perpendicular falls . 6. A segment of a circle is the figure contained by a ...
Σελίδα 2
... centre of the circle , is contained by the straight lines containing the angle and the circumference cut off by them . II . Similar segments of circles are those which admit equal angles , or in which the angles are equal to one another ...
... centre of the circle , is contained by the straight lines containing the angle and the circumference cut off by them . II . Similar segments of circles are those which admit equal angles , or in which the angles are equal to one another ...
Σελίδα 5
... centres , the other at the circumferences . Those others which have their vertices neither at the circumferences nor at the centres , but at some other points , are for that reason not called sectors but sector - like figures ( τομοειδῆ ...
... centres , the other at the circumferences . Those others which have their vertices neither at the circumferences nor at the centres , but at some other points , are for that reason not called sectors but sector - like figures ( τομοειδῆ ...
Σελίδα 6
... centre of the circle ABC . 15 For suppose it is not , but , if possible , let G be the centre , and let GA , GD , GB be joined . Then , since AD is equal to DB , and DG is common , G B E the two sides AD , DG are equal to the two sides ...
... centre of the circle ABC . 15 For suppose it is not , but , if possible , let G be the centre , and let GA , GD , GB be joined . Then , since AD is equal to DB , and DG is common , G B E the two sides AD , DG are equal to the two sides ...
Σελίδα 7
... centre of the circle ABC . Similarly we can prove that neither is any other point except F. Therefore the point F is the centre of the circle ABC . PORISM . From this it is manifest that , if in a circle a straight line cut a straight ...
... centre of the circle ABC . Similarly we can prove that neither is any other point except F. Therefore the point F is the centre of the circle ABC . PORISM . From this it is manifest that , if in a circle a straight line cut a straight ...
Συχνά εμφανιζόμενοι όροι και φράσεις
ABCD angle ABC angle BAC antecedent Aristotle base bisected centre circle ABC circumference construction continued proportion corresponding sides cube number definition diameter drawn enunciation equal angles equiangular equimultiples Euclid Eutocius ex aequali four magnitudes geometrical geometrical progression given circle given straight line greater ratio greatest common measure Heiberg hypothesis Iamblichus joined less mean proportional numbers measures the number multiple multitude Nicomachus odd number parallel parallelogram pentagon polygon Porism prime number Proclus Prop proper fraction proposition PROPOSITION 13 proved rect rectangle rectangle contained rectilineal figure reductio ad absurdum remaining angle right angles segment semicircle similar and similarly similar plane numbers Simson solid numbers square number subtracted taken Theon Theon of Smyrna theorem touches the circle triangle ABC unit VIII δὲ καὶ πρὸς τὸ τοῦ
Δημοφιλή αποσπάσματα
Σελίδα 34 - EQUAL straight lines in a circle are equally distant from the centre ; and those which are equally distant from the centre, are equal to one another.
Σελίδα 65 - If a straight line touch a circle, and from the point of contact a chord be drawn, the angles which this chord makes with the tangent are equal to the angles in the alternate segments.
Σελίδα 37 - THE straight line drawn at right angles to the diameter of a circle, from the extremity of...
Σελίδα 234 - Prove that similar triangles are to one another in the duplicate ratio of their homologous sides.
Σελίδα 64 - From this it is manifest that if one angle of a triangle be equal to the other two it is a right angle, because the angle adjacent to it is equal to the same two ; (i.
Σελίδα 209 - IN a right-angled triangle, if a perpendicular be drawn from the right angle to the base, the triangles on each side of it are similar to the whole triangle, and to one another.
Σελίδα 90 - EF at right angles (9. 1.) to AB, AC ; DF, EF produced meet one another : for, if they do not meet, they are parallel, wherefore AB, AC, which are at right angles to them, are parallel ; which is absurd : let them meet in F, and join FA ; also, if the point F be not in BC, join BF, CF : then, because AD is equal to DB, and DF common, and at right angles to AB, the base AF is equal (4.
Σελίδα 80 - In a given circle to place a straight line, equal to a given straight line which is not greater than the diameter of the circle. Let ABC be the given circle, and D the given straight line, not greater than the diameter of the circle.
Σελίδα 212 - ... be parallel to the remaining side of the triangle. Let DE be drawn parallel to BC, one of the sides of the triangle ABC : BD is to DA, as CE to EA. Join BE, CD ; Then the triangle BDE is equal to the triangle CDE*, * «.i.
Σελίδα 95 - In the same manner, it may be demonstrated that the straight lines EC, ED, are each of them equal to EA or EB ; therefore the four straight lines EA, EB, EC, ED, are equal to one another ; and the circle described from the centre E, at the distance of one of them, shall pass through the extremities of the other three, and be described about the square ABCD.