Elements of Geometry and Plane Trigonometry: With an Appendix, and Copious Notes and IllustrationsA. Constable & Company, 1817 - 432 Seiten |
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Seite 5
... right angles , being derived from the same measure , must be equal to each other . If a straight line CB stand at equal angles CBA and CBD on another straight line AD , and if the surface ACD be con- ceived laid over towards the ...
... right angles , being derived from the same measure , must be equal to each other . If a straight line CB stand at equal angles CBA and CBD on another straight line AD , and if the surface ACD be con- ceived laid over towards the ...
Seite 6
... angles is a right angle . E The angle contained by the opposite portions DA and DB of a straight line is hence equal to two right angles ; and , for the same rea- son , all the angles ADC , CDE , EDF and FDB , formed at the point D and ...
... angles is a right angle . E The angle contained by the opposite portions DA and DB of a straight line is hence equal to two right angles ; and , for the same rea- son , all the angles ADC , CDE , EDF and FDB , formed at the point D and ...
Seite 7
... angle is formed by the production of both its sides . 10. The inverted divergence of the two sides of an an- gle , or the defect of the angle from four right angles , is named the reverse angle . The angle DBE is vertical to ABC , ABD ...
... angle is formed by the production of both its sides . 10. The inverted divergence of the two sides of an an- gle , or the defect of the angle from four right angles , is named the reverse angle . The angle DBE is vertical to ABC , ABD ...
Seite 8
... angles . The third angle may therefore , by its charac- ter , serve to discriminate a triangle . 18. A right - angled triangle is that which has a right angle . 19. An obtuse angled triangle is that which has an obtuse angle . 20. An acute ...
... angles . The third angle may therefore , by its charac- ter , serve to discriminate a triangle . 18. A right - angled triangle is that which has a right angle . 19. An obtuse angled triangle is that which has an obtuse angle . 20. An acute ...
Seite 9
... angle of a rectilineal figure be 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 ...
... angle of a rectilineal figure be 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 ...
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Elements of Geometry, and Plane Trigonometry: With an Appendix, and Very ... University Professor Emeritus John Leslie, Sir Keine Leseprobe verfügbar - 2016 |
Häufige Begriffe und Wortgruppen
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
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Seite 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.
Seite 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...
Seite 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...
Seite 10 - A diameter of a circle is a straight line drawn through the centre, and terminated both ways by the circumference.
Seite 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.
Seite 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.
Seite 292 - Thus, for" example, he to whom the geometrical proposition, that the angles of a triangle are together equal to two right angles...
Seite 93 - UPON a given straight line to describe a segment of a circle containing an angle equal to a given rectilineal angle.
Seite 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.
Seite 58 - The rectangle contained by the sum and difference of two straight lines is equivalent to the difference of the squares of these lines.