## A SYSTEM OF GEOMETRY AND TRIGONOMETRY |

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### Common terms and phrases

according accurately added Arch Base Bearing C.Secant C.Sine calculated called Chord Circle Co-Sine Compass contained Course Decimals Dep Lat describe Diagonal Difference directions Dist Distance divided double draw drawn East equal EXAMPLE Field FIELD BOOK figures find the Area find the Leg four fourth give given gles greater half Hypothenuse Index Land Left Leg BC length less Line Links Logarithm Look manner measure method multiply N.CO N.S. NCS Natural Sines North North Areas Note opposite particular Perpendicular places PLATE Plot Point preceding PROBLEM Product Proportions protract Quotient Radius Remainder represent Rule Scale Secant Side Sine C.Tang Sine Sine Sine South Areas Square Star Station subtracted Suppose Surveying Surveyor Table Tang Tangent third Trapezoid Triangle TRIGONOMETRY true West whole

### Popular passages

Page 26 - 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.

Page 22 - The square of the hypothenuse is equal to the sum of the squares of the other two sides ; as, 5033 402+302.

Page 8 - The circumference of every circle is supposed to be divided into 360 equal parts, called degrees ; and each degree into 60 equal parts, called minutes ; and each minute into 60 equal parts, called seconds ; and these into thirds, &c.

Page 25 - TO THEIR DIFFERENCE ; So IS THE TANGENT OF HALF THE SUM OF THE OPPOSITE ANGLES', To THE TANGENT OF HALF THEIR DIFFERENCE.

Page 25 - The solution of this CASE depends on the following PROPOSITION. In every Plane Triangle, As the Sum of any two Sides ; Is to their Difference ; So is the Tangent of half the Sum of the two opposite Angles ; To the Tangent of half the Difference between them. Add this half difference to half the Sum of the Angles and you will have the greater Angle ; and...

Page 8 - The radius of a circle is a line drawn from the centre to the circumference, as A, B.

Page 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.

Page 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.