Elements of Geometry, Geometrical Analysis, and Plane Trigonometry: With an Appendix, Notes and Illustrations |
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Page 3
... intersection , constitutes an angle . If we obtain the idea of distance , or linear extent , from progressive motion , we derive that of diver- gence , or angular magnitude , from revolving mo- tion . GEOMETRY is divided into Plane and ...
... intersection , constitutes an angle . If we obtain the idea of distance , or linear extent , from progressive motion , we derive that of diver- gence , or angular magnitude , from revolving mo- tion . GEOMETRY is divided into Plane and ...
Page 5
... intersection , its ver- tex . To abridge the reference , it is usual to denote an angle by tracing over its sides ; the letter at the vertex , which is common to them both , being placed in the middle . Thus the angle contained by the ...
... intersection , its ver- tex . To abridge the reference , it is usual to denote an angle by tracing over its sides ; the letter at the vertex , which is common to them both , being placed in the middle . Thus the angle contained by the ...
Page 32
... intersect each other in E ; the part AE is equal to CE , and DE to BE . For because a rhomboid is also a parallelogram ( I. 28. ) , the alternate angles BAC and ACD are equal ( I. 25. ) , and likewise ABD and BDC . The tri- A angles AEB ...
... intersect each other in E ; the part AE is equal to CE , and DE to BE . For because a rhomboid is also a parallelogram ( I. 28. ) , the alternate angles BAC and ACD are equal ( I. 25. ) , and likewise ABD and BDC . The tri- A angles AEB ...
Page 85
... intersections C and D. And because B is a point different from the centre A of the circle DCF , not more than two straight lines BC and BD can be drawn from E F BA D it to the circumference of that E B A circle ( III . 9 ...
... intersections C and D. And because B is a point different from the centre A of the circle DCF , not more than two straight lines BC and BD can be drawn from E F BA D it to the circumference of that E B A circle ( III . 9 ...
Page 86
... intersection of the straight lines DF and EF , which marks the centre , is a single point . Cor . Hence the mode of describing a circle about a given triangle ABC . PROP . XII . THEOR . Equal chords are equidistant from the centre of a ...
... intersection of the straight lines DF and EF , which marks the centre , is a single point . Cor . Hence the mode of describing a circle about a given triangle ABC . PROP . XII . THEOR . Equal chords are equidistant from the centre of a ...
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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.