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AC by Theor AC—BC adjacent Angle Angle ABC Angle ACB BD be drawn bisecting Chord Circle Co-f Co-s Co-sine BC Co-tangent of Half common Logarithm Corollary Degrees Diameter dius E. D. Prop equal to Half Excess Extremes fame ference find the Sine Fourth-proportional garithms gles Great-Circles half the Base half the Difference Half the Sum half the vertical half this Angle Hence hyperbolic Logarithm Hypothenuse AC known Leg BC let BD manifest Moreover opposite Angle passing thro pendicular perpendicular plane Triangle ABC Progress1on Proportion Radius right-angled spherical Triangle Right-line s1nce Secant Sides AC Sine BCD Sine of half spherical Angle spherical Triangle ABC subtracted supposed Table Tang Tangent of Half Tbeor Terms Theorem Trigonometry Unity versed Sine vertical Angle whence
Page 1 - 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.
Page 6 - In every plane triangle, it will be, as the sum of any two sides is to their difference...
Page 41 - The sum of the logarithms of any two numbers is equal to the logarithm of their product. Therefore, the addition of logarithms corresponds to the multiplication of their numbers.
Page 13 - If the sine of the mean of three equidifferent arcs' dius being unity) be multiplied into twice the cosine of the common difference, and the sine of either extreme be deducted from the product, the remainder will be the sine of the other extreme. (B.) The sine of any arc above 60°, is equal to the sine of another arc as much below 60°, together with the sine of its excess above 60°. Remark. From this latter proposition, the sines below 60° being known, those of arcs above 60° are determinable...
Page 31 - ... is the tangent of half the vertical angle to the tangent of the angle which the perpendicular CD makes with the line CF, bisecting the vertical angle.
Page 73 - BD, is to their Difference ; fo is the Tangent of half the Sum of the Angles BDC and BCD, to the Tangent of half their Difference.
Page 28 - As the sum of the sines of two unequal arches is to their difference, so is the tangent of half the sum of those arches to the tangent of half their difference : and as the sum...