A System of Geometry and Trigonometry: Together with a Treatise on Surveying : Teaching Various Ways of Taking the Survey of a Field : Also to Protract the Same and Find the Area : Likewise, Rectangular Surveying, Or, an Accurate Method of Calculating the Area of Any Field Arithmetically, Without the Necessity of Plotting it : to the Whole are Added Several Mathematical Tables, with a Particular Explanation and the Manner of Using Them : Compiled from Various AuthorsOliver D. Cooke, 1804 - 168 páginas |
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Página 12
... Note . An Angle is esteemed greater or less accord- ing to the opening of the Lines which form it , or as the Arch intercepted by those Lines contains more or fewer Degrees . Hence it may be observ- ed , that the bigness of an Angle ...
... Note . An Angle is esteemed greater or less accord- ing to the opening of the Lines which form it , or as the Arch intercepted by those Lines contains more or fewer Degrees . Hence it may be observ- ed , that the bigness of an Angle ...
Página 13
... Note . The three Angles of every Triangle being added together will amount to 180 Degrees ; con- sequently the two Acute Angles of a Right Angled Triangle amount to 90 Degrees , the Right Angle being also 90 . 40. The perpendicular ...
... Note . The three Angles of every Triangle being added together will amount to 180 Degrees ; con- sequently the two Acute Angles of a Right Angled Triangle amount to 90 Degrees , the Right Angle being also 90 . 40. The perpendicular ...
Página 15
... Note . There are other methods of erecting a Per- pendicular , but this is the most simple . PROBLEM IV . From a given Point , as at C , to drop a Perpendicular on a given Line AB . Fig . 25 . With one foot of the Dividers in C describe ...
... Note . There are other methods of erecting a Per- pendicular , but this is the most simple . PROBLEM IV . From a given Point , as at C , to drop a Perpendicular on a given Line AB . Fig . 25 . With one foot of the Dividers in C describe ...
Página 16
... Note : In a similar manner Angles may be measured ; that is , with a Chord of 60 Degrees describe an Arch on the ... Note after the 39th Geometrical Defi nition . Note . When Degrees and Minutes are expressed , they are distinguished ...
... Note : In a similar manner Angles may be measured ; that is , with a Chord of 60 Degrees describe an Arch on the ... Note after the 39th Geometrical Defi nition . Note . When Degrees and Minutes are expressed , they are distinguished ...
Página 17
... Note . The length of the two Legs may be found by measuring them upon the same Scale of equal parts from which the Hypothenuse was taken . PROBLEM X. To make a Right Angled Triangle , the Angles and one Leg being given . Fig . 31 ...
... Note . The length of the two Legs may be found by measuring them upon the same Scale of equal parts from which the Hypothenuse was taken . PROBLEM X. To make a Right Angled Triangle , the Angles and one Leg being given . Fig . 31 ...
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System of Geometry and Trigonometry: Together with a Treatise on Surveying ... Abel Flint Sin vista previa disponible - 2017 |
System of Geometry and Trigonometry: Together With a Treatise on Surveying ... Abel Flint Sin vista previa disponible - 2017 |
Pasajes populares
Página 28 - As the base or sum of the segments Is to the sum of the other two sides, So is the difference of those sides To the difference of the segments of the base.
Página 27 - TO THEIR DIFFERENCE ; So IS THE TANGENT OF HALF THE SUM OF THE OPPOSITE ANGLES', To THE TANGENT OF HALF THEIR DIFFERENCE.
Página 6 - The Circumference of every circle is supposed to be divided into 360 equal parts, called Degrees ; and each degree into 60 Minutes, each minute into 60 Seconds, and so on.
Página 24 - In this case the" hypothenuse may be found by the square root without finding the angles ; according to the following PROPOSITION. IN EVERY RIGHT ANGLED TRIANGLE, THE SUM OF THE SQUARES OF THE TWO LEGS IS EQUAL TO THE SQUARE OF THE HYPOTHENUSE. In the above EXAMPLE, the square of AB 78.7 is 6193.69, the square of BC 89 is 7921 ; these added make 14114,69 the square root of which is nearest 119.
Página 40 - Field work and protraction are truly taken and performed ; if not, an error must have been committed in one of them : In such cases make a second protraction ; if this agrees with the former, it is to be presumed the fault is in the Field work ; a re-survey must then be taken.
Página 33 - To find the area of a trapezoid. RULE. Multiply half the sum of the two parallel sides by the perpendicular distance between them : the product will be the area.
Página 6 - Therefore all radii of the same circle are equal. 13. The diameter of a circle is a right line drawn from one side of the circumference to the other, passing through the centre ; and it divides the circle into two equal parts, called semicircles ; as AB or DE.
Página 40 - Let his attention first be directed to the map, and inform him that the top is north, the bottom south, the right hand east, and the left hand west.
Página 23 - The square of the hypothenuse is equal to the sum of the squares of the other two sides ; as, 5033 402+302.