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" Four quantities are said to be in proportion when the product of the extremes is equal to that of the means, thus if A multiplied by D, be equal to B multiplied by C, then A is said to be to B as C is to D. POSTULATES OR PETITIONS. 1 . That a right line... "
A Treatise of Practical Surveying: Which is Demonstrated from Its First ... - Page 19
by Robert Gibson - 1795 - 319 pages
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A Treatise of Practical Surveying: Which is Demonstrated from Its First ...

Robert Gibson - Surveying - 1806 - 486 pages
...are called irregular polygons, as an irregular pentagon, hexagon, &c. 51. Four quantities are said to be in proportion when the product of the extremes...multiplied by D, be equal to B multiplied by C, then A is said to be to B as C is to D. POSTULATES OR PETITIONS. 1 . That a right line may be drawn from any...
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A Treatise of Practical Surveying, ...

Robert Gibson - 1808 - 482 pages
...are called irregular polygons, as an irregular pentagon, hexagon, &c. 51. Four quantities are said to be in proportion when the product of the extremes...multiplied by D, be equal to B multiplied by C, then A is said to be to B as C is to D. POSTULATES OR PETITIONS. 1 . That a right line may be drawn from any...
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The Theory and Practice of Surveying: Containing All the Instructions ...

Robert Gibson - Surveying - 1811 - 580 pages
...called irregular polygons, as an irregular pentagon, hexagon, SCc. .« 49. Four quantities are said to be in proportion when the product of the extremes...multiplied by D, be equal to B multiplied by C, then A is said to be to B as C is to D. POSTULATES OR PETITIONS. 1. That a right line mav be drawn from any one...
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The Theory and Practice of Surveying: Containing All the Instructions ...

Robert Gibson - Surveying - 1814 - 558 pages
...are called irregular polygons, as an irregular pentagon, hexagon, 6,'c. 49. Four quantities are said to be in proportion when the product of the extremes...the means : thus if A multiplied by D, be equal to В multiplied by C} then A is said to 1.3 to. В as С is to D. POSTULATES OR PETITIONS. 1. That a...
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The Theory and Practice of Surveying: Containing All the Instructions ...

Robert Gibson - Surveying - 1832 - 290 pages
...are called irregular polygons, as an irregular pentagon, hexagon, &c. 49. Four quantities are said to be in proportion when the product of the extremes...multiplied by D be equal to B multiplied by C, then A is said to be to £ as C is to D. POSTULATES, OR PETITIONS. 1. That a right line may be drawn from anyone...
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Popular Mathematics: Being the First Elements of Arithmetic, Algebra, and ...

Robert Mudie - Mathematics - 1836 - 524 pages
...second and third the means ; and the definition may be also expressed, Four quantities are proportional when the product of the extremes is equal to that of the means. As this is a perfectly simple definition, it holds true conversely, so that we can either infer the...
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Popular Mathematics: Being the First Elements of Arithmetic, Algebra, and ...

Robert Mudie - Mathematics - 1836 - 542 pages
...second and third the means ; and the definition may be also expressed, Four quantities are proportional when the product of the extremes is equal to that of the means. As this is a perfectly simple definition, it holds true conversely, so that we can either infer the...
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The Theory and Practice of Surveying: Containing All the Instructions ...

Robert Gibson, James Ryan - Surveying - 1839 - 452 pages
...are called irregular polygons, as an irregular pentagon, hexagon, &e. 49. Four quantities are said 10 be in proportion when the product of the extremes is equal to that of the means i thus if A multiplied by D be equal to B multiplied by C, then A is said to be to B as C is to D....
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Hints, Theoretical, Elucidatory, and Practical, for the Use of Teachers of ...

Olinthus Gregory - Euclid's Elements - 1840 - 208 pages
...by equal fractions, be carefully pointed out. (A.) When four numbers are direct proportionals, the product of the extremes is equal to that of the means. Thus: — If then, also, But Cor. Hence ad C whence the rules of proporc — -j- < . . . . . rr 6 I tion in arithmetic....
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Hints, Theoretical, Elucidatory, and Practical, for the Use of Teachers of ...

Olinthus Gregory - Euclid's Elements - 1840 - 204 pages
..." y ' since each has the same ratio to unity. (h.~) When four numbers are direct proportionals, the product of the extremes is equal to that of the means. Thus: — __ ad C whence the rules of propor6 1 tion in arithmetic. [Let it be remarked that the ordinary...
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