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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.
Elements of Geometry, Geometrical Analysis, and Plane Trigonometry: With an ... - Pągina 155
per Sir John Leslie - 1809 - 493 pągines
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## The Elements of Euclid, the parts read in the University of Cambridge [book ...

Euclides - 1846
...(S. 16) : xiv. Invertendo, by inversion ; when there are four proportionals, and it is inferred, that the second is to the first as the fourth to the third (S. B) : xv. Componendo, by composition ; when there are four proportionals, and it is inferred that...
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## Euclid's Elements of geometry, the first three books (the fourth, fifth, and ...

Euclides - 1846
...becomes A to C as B to Do. 15. By Inversion, when it is inferred that if four magnitudes be proportional, the second is to the first as the fourth to the third; as is demonstrated in Prop. 20, namely — A to B as CD to E, becomes B to A as E to CD. 16. By Composition,...
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## Ray's Algebra, Part First: On the Analytic and Inductive Methods of ..., Part 1

Joseph Ray - 1848 - 240 pągines
...quantities are in proportion, they will be in proportion by INVERSION ; that is, the second will be to the first as the fourth to the third. Let a : b : : c : d. By Art. 244, ad=bc. Dividing both sides by 6, ~T=CDividing both sides by d, i=jThat is, b : a : : d...
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## The definitions, postulates, axioms, and enunciations of the propositions of ...

Euclides - 1848
...Fifth Book. XIV. Invertendo, by inversion; when there are four proportionals, and it is inferred, that the second is to the first, as the fourth to the third. Prop. B, Book v. XV. Componendo, hy composition ; when there are four proportionals, and it is inferred...
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## Ray's Algebra, Part First: On the Analytic and Inductive Methods of ...

Joseph Ray - 1848 - 240 pągines
...quantities are in proportion, they will be in proportion by INVERSION ; that is, the second m1l be to the first as the fourth to the third. Let a : b : : e : d. By Art. 244, ad=bc. Dividing both sides by b, -r=cft fDividing both sides by d, T— 3That...
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## The practice and theory of arithmetic

...dcca a X t, — = — , >•*• c : a :: -d : b. ba Cor. 1. Hence, if four numbers are proportional, the second is to the first as the fourth to the third. For if a : b :: c : d, a X rf= b X c ; .-. from the Prop, b : a : : d : c. Cor. 2. Also, in the same...
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## The first six books of the Elements of Euclid, with numerous exercises

Euclides - 1853 - 147 pągines
...5th Book. XIV. Invertendo, by inversion ; when there are four proportionals, and it is inferred that the second is to the first as the fourth to the third. Prop. B. Book 5. XV. Componenda, by composition ; when there are four proportionals, and it is inferred...
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## The geometry, by T. S. Davies. Conic sections, by Stephen Fenwick

...5th Book. 14. Invertendo, by inversion ; when there are four proportionals, and it is inferred, that the second is to the first as the fourth to the third. Prop. B., Book V. 15. Componendo, by composition ; when there are four proportionals, and it is inferred...
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## Orr's Circle of the Sciences: The mathematical sciences

William Somerville Orr - 1854
...•=. Ķ . 3. If four quantities are proportional they are proportional when taken inversely, that is, the second is to the first as the fourth to the third : thus, ifa:6::c:d, then Ь : a ; : 4 : e ; because from ,- = -j we get, by taking the reciprocals,...
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