## Mathematical tables |

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altitude angle ABC arch arithmetical series axis base cent centre circle circular sector circumference common logarithm complement of angle Cos2 Cosec Cosine Secant cylinder decimal denote determined diameter distance ellipse equal equation evident find angle find BC find the area find the solid formula frustum geometrical series greater half the difference half the perimeter half the sum height Hence hypotenuse AC inches length less than 90 measuring miles multiply N.cos nearly number of degrees observed obtain parabola paraboloid perpendicular plane Prob PROBLEM quadrant radius rectangle contained Required the area right ascension right-angled spherical triangle right-angled triangle rule Secant Cotang segment side AC sine and cosine sine of half slant height solid content square station subtract supplement suppose surface Tang tangent tangent of half theodolite Theor THEOREM triangle ABC vertical angle yards

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Page 75 - In any plane triangle, as the sum of any two sides is to their difference, so is the tangent of half the sum of the opposite angles to the tangent of half their difference. Let ABC be a triangle, of which the side AC is greater than AB,