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 Joseph Cushing, 1816 - 472 páginas |
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Página 33
... lines . 28. Any figure of four sides is called a quadrilateral figure . 29. Quadrilateral figures whose opposite sides are parallel , are called 5 : parallelograms : thus ABCD is a parallelogram . fig . GEOMETRY . 33.
... lines . 28. Any figure of four sides is called a quadrilateral figure . 29. Quadrilateral figures whose opposite sides are parallel , are called 5 : parallelograms : thus ABCD is a parallelogram . fig . GEOMETRY . 33.
Página 34
... opposite sides are equal and angles oblique ; as B fig . 19 . 34. Any quadrilateral figure that is not a parallelogram , is called a trapezium . fig . 100 . 1 fig . 100 . B d C b D equal to each They some- 35. Figures which consist of ...
... opposite sides are equal and angles oblique ; as B fig . 19 . 34. Any quadrilateral figure that is not a parallelogram , is called a trapezium . fig . 100 . 1 fig . 100 . B d C b D equal to each They some- 35. Figures which consist of ...
Página 39
... opposite angles made by those lines , will be equal to each other : that is , AEB to CED fig.21 . C B D A and BEC to AED . fig . 21 . By theorem 1. BEC + CED = 2 right angles . and CED + DEA = 2 right angles . Therefore ( by axiom 1 ...
... opposite angles made by those lines , will be equal to each other : that is , AEB to CED fig.21 . C B D A and BEC to AED . fig . 21 . By theorem 1. BEC + CED = 2 right angles . and CED + DEA = 2 right angles . Therefore ( by axiom 1 ...
Página 40
... 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 is , BEF + DFE are equal to two right angles , and AEF ÷ CFE are equal to ...
... 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 is , BEF + DFE are equal to two right angles , and AEF ÷ CFE are equal to ...
Página 41
... opposite angles taken together . Viz . to B and A. fig . 23 . fig . 23 . E Thro ' C , let CE be drawn parallel to AB ; then since BD cuts the two parallel lines BA , CE ; the angle ECD B ( by part 3. of the last theo . ) and again ...
... opposite angles taken together . Viz . to B and A. fig . 23 . fig . 23 . E Thro ' C , let CE be drawn parallel to AB ; then since BD cuts the two parallel lines BA , CE ; the angle ECD B ( by part 3. of the last theo . ) and again ...
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A Treatise of Practical Surveying: Which is Demonstrated From Its First ... Robert Gibson Sin vista previa disponible - 2021 |
Términos y frases comunes
20 perches 50 Dist ABCD acres altitude annexed Answer base bearing bisect blank line centre chains and links chord circle circumferentor Co-secant Secant Co-sine Co-tang column contained cyphers decimal decimal fraction Dep Lat difference 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 magnetical measure meridian distance multiplied needle number of degrees object off-sets parallel parallelogram perpendicular piece of ground plane Portmarnock PROB proportion protractor quotient radius right angles right line scale of equal SCHOLIUM sect semicircle side sights sine square root stationary distance sun's suppose survey taken tance Tang tangent thence theo theodolite THEOREM thro trapezium triangle ABC trigonometry true amplitude true azimuth two-pole chains vane variation whence