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" ED. that is as the sum of the two sides AB and BC, is to their difference ; so is the tangent of half the sum of the two unknown angles A and C, to the tangent of half their difference. "
A Treatise of Practical Surveying: Which is Demonstrated from Its First ... - Strona 89
autor: Robert Gibson - 1795 - Liczba stron: 319
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The Theory and Practice of Surveying: Containing All the Instructions ...

Robert Gibson - 1811 - Liczba stron: 508
...cor 1. theo. 30 sect. 4.) But the wholes are as their halves, that is, AH: Iff : : CE : ED, that ia as the sum of the two sides AB and BC, is to their difference ; so is the tangent of half the sum of the two unknown angles A and C, to the tangent of half their...
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The Theory and Practice of Surveying: Containing All the Instructions ...

Robert Gibson - 1814 - Liczba stron: 508
...AC; AH: IH: : CH : GH. (by cor. 1. theo. 20. sect. 4.) But the wholes are as their halves, that is, AH : IH: : CE : ED, that is as the sum of the two sides AB and BC, is to their difference ; so is the tangent of half the sum of the two unknown angles A and G, to the tangent of half their...
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The Theory and Practice of Surveying: Containing All the Instructions ...

Robert Gibson - 1821 - Liczba stron: 544
...AH: 1H : : CH .• GH. (by cor. 1. theo. 20. sect. 4.) But the wholes are as their halves, that is, AH: IH : : CE : ED. that is as the sum of the two sides AB and BC, is to their difference ; so is the tangent of half the sum of the two unknown angles A and C, to the tangent of half their...
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The Theory and Practice of Surveying: Containing All the Instructions ...

Robert Gibson, James Ryan - 1839 - Liczba stron: 412
...CH i GH (by cor. 1, theo. 20, sect. 4). But the wholes are as their halves; that is, AH i IH ii CE i ED; that is, as the sum of the two sides AB and BC is to their difference, so is the tangent of half the sum of the two unknown angles A and C to the tangent of half their difference....
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A Manual of Surveying for India, Detailing the Mode of Operations on the ...

Ralph Smyth, Sir Henry Edward Landor Thuillier - 1851 - Liczba stron: 718
...to AC ; AH : IH : : CH : GH. (by Cor. I. Theo. 19, Chap. II.) But the wholes are as their halves, or AH : IH : : CE :ED, that is, as the sum of the two sides AB and BC, is to their difference ; so is the tangent of half the sum of the two unknown angles A and C, to the tangent of half their...
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