Elements of Geometry and Plane Trigonometry: With an Appendix, and Copious Notes and IllustrationsA. Constable & Company, 1817 - 432 σελίδες |
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Σελίδα v
... less elemen- tary to the Notes . Other Notes of a simpler kind are intended chiefly to engage the attention of the young student . In various parts of the work , the demonstrations are occasionally abbre- viated . The Elements of ...
... less elemen- tary to the Notes . Other Notes of a simpler kind are intended chiefly to engage the attention of the young student . In various parts of the work , the demonstrations are occasionally abbre- viated . The Elements of ...
Σελίδα 6
... less than a right angle . 7. An obtuse angle is greater than a right angle . 8. One side of an angle forms with the other produced a supplemental or exterior angle . 9. A verticat angle is formed by the production of 6 ELEMENTS OF ...
... less than a right angle . 7. An obtuse angle is greater than a right angle . 8. One side of an angle forms with the other produced a supplemental or exterior angle . 9. A verticat angle is formed by the production of 6 ELEMENTS OF ...
Σελίδα 9
... less than two right angles , it protrudes , and is called salient ; if it be greater than two right angles , it makes a sinuosity , and is termed re - entrant . Thus the angle ABC is re - entrant , and the rest of the angles of the ...
... less than two right angles , it protrudes , and is called salient ; if it be greater than two right angles , it makes a sinuosity , and is termed re - entrant . Thus the angle ABC is re - entrant , and the rest of the angles of the ...
Σελίδα 19
... less than BCD and BCA , that is , less than two right angles ( Def . 4 ) . Cor . Hence a triangle can only have one right or ob- túse angle , its two remaining angles being always acute . PROP . X. THEOR . The angles at the base BOOK I. 19.
... less than BCD and BCA , that is , less than two right angles ( Def . 4 ) . Cor . Hence a triangle can only have one right or ob- túse angle , its two remaining angles being always acute . PROP . X. THEOR . The angles at the base BOOK I. 19.
Σελίδα 22
... less . But it cannot be equal , be- cause the angle CAB would then be equal to ACB ( I. 10. ) ; nor can BC be less than AB , for then AB would be greater than BC , and consequently ( I. 12. ) the angle ACB would be greater than CAB , or ...
... less . But it cannot be equal , be- cause the angle CAB would then be equal to ACB ( I. 10. ) ; nor can BC be less than AB , for then AB would be greater than BC , and consequently ( I. 12. ) the angle ACB would be greater than CAB , or ...
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Άλλες εκδόσεις - Προβολή όλων
Elements of Geometry, and Plane Trigonometry: With an Appendix, and Very ... University Professor Emeritus John Leslie, Sir Δεν υπάρχει διαθέσιμη προεπισκόπηση - 2016 |
Συχνά εμφανιζόμενοι όροι και φράσεις
ABCD adjacent angle altitude angle ABC angle ADB angle BAC base AC bisect centre chord circle circumference consequently construction contained angle cosine decagon denote describe diameter difference distance diverging lines divided draw equal to BC equilateral triangle equivalent to twice evidently exterior angle given greater half Hence hypotenuse inscribed isosceles triangle join let fall likewise measure parallel perpendicular point G polygon PROB PROP Proposition quadrilateral figure quantities radius ratio rectangle rectangle contained rectilineal figure rhomboid right angles right-angled triangle Scholium segments semicircle semiperimeter side AC sides AB sine square of AC squares of AB straight line tangent THEOR tion triangle ABC twice the rectangle twice the square vertex vertical angle whence Wherefore
Δημοφιλή αποσπάσματα
Σελίδα 30 - ... if a straight line, &c. QED PROPOSITION 29. — Theorem. If a straight line fall upon two parallel straight lines, it makes the alternate angles equal to one another ; and the exterior angle equal to the interior and opposite upon the same side ; and likewise the two interior angles upon the same side together equal to two right angles.
Σελίδα 333 - The first of four magnitudes is said to have the same ratio to the second which the third has to the fourth, when any...
Σελίδα 294 - If a straight line meets two straight lines, so as to " make the two interior angles on the same side of it taken " together less than two right angles...
Σελίδα 10 - A diameter of a circle is a straight line drawn through the centre, and terminated both ways by the circumference.
Σελίδα 137 - Componendo, by composition ; when there are four proportionals, and it is inferred that the first together with the second, is to the second, as the third together with the fourth, is to the fourth.
Σελίδα 84 - The angle at the centre of a circle is double of the angle at the circumference upon the same base, that is, upon the same part of the circumference.
Σελίδα 292 - Thus, for" example, he to whom the geometrical proposition, that the angles of a triangle are together equal to two right angles...
Σελίδα 93 - UPON a given straight line to describe a segment of a circle containing an angle equal to a given rectilineal angle.
Σελίδα 38 - All the interior angles of any rectilineal figure, together with four right angles, are equal to twice as many right angles as the figure has sides.
Σελίδα 58 - The rectangle contained by the sum and difference of two straight lines is equivalent to the difference of the squares of these lines.