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 páginas |
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Página 26
... side , equal to each other , these angles are called right angles , and the line CD a perpendicular . fig . 8 . B fig . 6 . fg . 7 C D 12. An obtuse angle is that which is greater than a right one , as the angle ADE , fig . 7. and an ...
... side , equal to each other , these angles are called right angles , and the line CD a perpendicular . fig . 8 . B fig . 6 . fg . 7 C D 12. An obtuse angle is that which is greater than a right one , as the angle ADE , fig . 7. and an ...
Página 28
... sides ; and 2d , to its angles . 20. In respect to its sides it is ei- ther equilateral , having the three sides equal , as A. fig . 10 . 21. Or isosceles , having two equal -sides , as B , fig . 11 . fig . 10 . A fig . 11 . C 串 22. Or ...
... sides ; and 2d , to its angles . 20. In respect to its sides it is ei- ther equilateral , having the three sides equal , as A. fig . 10 . 21. Or isosceles , having two equal -sides , as B , fig . 11 . fig . 10 . A fig . 11 . C 串 22. Or ...
Página 29
... 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 , and BC be made its base ...
... 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 , and BC be made its base ...
Página 30
... sides are equal and angles right , is called a rectangle or an oblong , as ABCD , fig . 3 . 32. A rhombus is a parallelogram of equal sides , and has its angles ob- lique , as fig . 18 . 33. A rhomboides is a parallelo- gram whose ...
... sides are equal and angles right , is called a rectangle or an oblong , as ABCD , fig . 3 . 32. A rhombus is a parallelogram of equal sides , and has its angles ob- lique , as fig . 18 . 33. A rhomboides is a parallelo- gram whose ...
Página 34
... side of a right line ; all the angles made by these lines will be equal to two right angles . 2. And all the angles which can he made about a point , will be equal to four right angles . THEOREM II . If one right line cross another ...
... side of a right line ; all the angles made by these lines will be equal to two right angles . 2. And all the angles which can he made about a point , will be equal to four right angles . THEOREM II . If one right line cross another ...
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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 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