Elements of Geometry, Geometrical Analysis, and Plane Trigonometry: With an Appendix, Notes and Illustrations |
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Page 5
... remaining the same ; CB will , in this new position EB , make an- gles EBA and EBD equal to the former , and therefore all of them equal to each other . But the four angles ABC , CBD , B DBE and EBA constitute about the point D a ...
... remaining the same ; CB will , in this new position EB , make an- gles EBA and EBD equal to the former , and therefore all of them equal to each other . But the four angles ABC , CBD , B DBE and EBA constitute about the point D a ...
Page 19
... remaining angles , such as BAC , be likewise acute , the two angles ACB and BAC are both of them acute . But if the angle BAC be either obtuse or a right an- gle , it comes under the two former cases , and the other angles ABC and ACB ...
... remaining angles , such as BAC , be likewise acute , the two angles ACB and BAC are both of them acute . But if the angle BAC be either obtuse or a right an- gle , it comes under the two former cases , and the other angles ABC and ACB ...
Page 32
... remaining angles at B and D , being equal to each other and to two right angles , must be right angled . PROP . XXX . THEOR . If the parallel sides of a trapezoid be equal , the other sides are likewise equal and parallel . Let the ...
... remaining angles at B and D , being equal to each other and to two right angles , must be right angled . PROP . XXX . THEOR . If the parallel sides of a trapezoid be equal , the other sides are likewise equal and parallel . Let the ...
Page 34
... double of those of an- other triangle ; its remaining opposite interior angle will also be double of the corresponding angle of the other . PROP . XXXV . THEOR . The angles round any 11 34 ELEMENTS OF GEOMETRY . PROP. XXXIV. THEOR. ...
... double of those of an- other triangle ; its remaining opposite interior angle will also be double of the corresponding angle of the other . PROP . XXXV . THEOR . The angles round any 11 34 ELEMENTS OF GEOMETRY . PROP. XXXIV. THEOR. ...
Page 64
... remaining part . Let AB be the straight line which it is required to di- vide into two segments , such that the square of the one shall be equivalent to the rectangle contained by the whole line and the other . Produce AB till BC be ...
... remaining part . Let AB be the straight line which it is required to di- vide into two segments , such that the square of the one shall be equivalent to the rectangle contained by the whole line and the other . Produce AB till BC be ...
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Common terms and phrases
ABCD ANALYSIS angle ABC angle ACB angle BAC bisect centre chord circumference COMPOSITION conse consequently the angle decagon describe a circle diameter distance diverging lines draw drawn equal to BC evidently exterior angle fall the perpendicular given circle given in position given point given ratio given space given straight line greater hence hypotenuse inflected inscribed intercepted intersection isosceles triangle join let fall likewise mean proportional parallel perpendicular point F polygon porism PROB PROP quently radius rectangle rectangle contained regular polygon rhomboid right angles right-angled triangle Scholium segments semicircle semiperimeter sequently side AC similar sine square of AC squares of AB tangent THEOR triangle ABC twice the square vertex vertical angle whence wherefore
Popular passages
Page 460 - The first of four magnitudes is said to have the same ratio to the second which the third has to the fourth, when...
Page 28 - ... 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.
Page 145 - The first and last terms of a proportion are called the extremes, and the two middle terms are called the means.
Page 34 - 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.
Page 153 - 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.
Page 16 - PROP. V. THEOR. The angles at the base of an isosceles triangle are equal to one another; and if the equal sides be produced, the angles -upon the other side of the base shall be equal. Let ABC be an isosceles triangle, of which the side AB is equal to AC, and let the straight lines AB, AC, be produced to D and E: the angle ABC shall be equal to the angle ACB, and the angle...
Page 411 - C' (89) (90) (91) (92) (93) 112. In any plane triangle, the sum of any two sides is to their difference as the tangent of half the sum of the opposite angles is to the tangent of half their difference.
Page 58 - Prove, geometrically, that the rectangle of the sum and the difference of two straight lines is equivalent to the difference of the squares of those lines.
Page 64 - IF a straight line be bisected, and produced to any point: the rectangle contained by the whole line thus produced, and the part of it produced, together with the square...
Page 157 - When any number of quantities are proportionals, as one antecedent is to its consequent, so is the sum of all the antecedents to the sum of all the consequents.