A Treatise on Practical Surveying: Which is Demonstrated from Its First Principles : Wherein Every Thing that is Useful and Curious in that Art, is Fully Considered and ExplainedF. Lucas, jun. and Cushing & Jewett, J. Robinson printer, 1822 - 326 σελίδες |
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Σελίδα 29
... triangles , in all which any side may be called the base , and the other two the sides . 27. The perpendicular height of a triangle is a line drawn from the vertex to the base perpendicularly : thus if the triangle ABC , be propos- ed ...
... triangles , in all which any side may be called the base , and the other two the sides . 27. The perpendicular height of a triangle is a line drawn from the vertex to the base perpendicularly : thus if the triangle ABC , be propos- ed ...
Σελίδα 36
... angle will be equal to the inter- nal and opposite one on the same side , that is , GEB = EFD and AEG = CFE . 4. And the sum of the internal angles on the same side are equal to two right angles ; that ... triangle ABC , one of 36 THEOREMS .
... angle will be equal to the inter- nal and opposite one on the same side , that is , GEB = EFD and AEG = CFE . 4. And the sum of the internal angles on the same side are equal to two right angles ; that ... triangle ABC , one of 36 THEOREMS .
Σελίδα 37
... triangle ABC , one of its legs , as BC , being produced to- wards D , it will make the external angle ACD equal to ... triangle ABC , all the three angles taken together are equal to two right angles , viz . A + B + ACB = 2 right angles ...
... triangle ABC , one of its legs , as BC , being produced to- wards D , it will make the external angle ACD equal to ... triangle ABC , all the three angles taken together are equal to two right angles , viz . A + B + ACB = 2 right angles ...
Σελίδα 38
... angle ; therefore 90 - one acute angle , gives the other . THEOREM VI . If in any two triangles , ABC , DEF , there be two sides AB , AC in the one , severally equal to DE , DF in the other , and the angle A contained between the two ...
... angle ; therefore 90 - one acute angle , gives the other . THEOREM VI . If in any two triangles , ABC , DEF , there be two sides AB , AC in the one , severally equal to DE , DF in the other , and the angle A contained between the two ...
Σελίδα 39
... triangle a b c be equal to each other that is , ac = cb ; the angles which are opposite to those equal sides , will also be equal to each other ; viz . a = b . fig . 11 . For let the triangle a b c be divided into two tri- angles a cd ...
... triangle a b c be equal to each other that is , ac = cb ; the angles which are opposite to those equal sides , will also be equal to each other ; viz . a = b . fig . 11 . For let the triangle a b c be divided into two tri- angles a cd ...
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A Treatise of Practical Surveying: Which is Demonstrated From Its First ... Robert Gibson Δεν υπάρχει διαθέσιμη προεπισκόπηση - 2021 |
Συχνά εμφανιζόμενοι όροι και φράσεις
20 perches ABCD acres altitude Answer base bearing blank line centre chains and links chord circle circumferentor Co-secant co-sine Co-tang column compass contained cyphers decimal decimal fraction difference Dist divided divisor draw east edge EXAMPLE feet field-book figures four-pole chains given angle half the sum height Hence hypothenuse inches instrument latitude length logarithm measure meridian distance multiplied needle number of degrees object off-sets opposite parallel parallelogram perpendicular piece of ground plane polygon Portmarnock PROB proportion protractor quotient radius right angles right line scale of equal SCHOLIUM secant second station sect semicircle side sights sine square root stationary distance stationary line sun's suppose survey taken tang tangent thence theo theodolite THEOREM thro triangle ABC trigonometry true amplitude true azimuth two-pole chains vane variation whence