## Five-place Logarithmic and Trigonometric Tables |

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9 log acute angle altitude angle of elevation azimuth celestial equator colog cologarithm Compute cos x cos² cosine cot A cot cot tan cot cotangent cotx csc b csc declination earth's ecliptic equal EXAMPLE Exercise feet Find the angle Find the area Find the distance Find the height Find the value formulas functions Given the latitude Hence horizon hour angle hypotenuse included angle isosceles length log cot log log tan log logarithm loge longitude mantissa meridian miles Napier's Rules negative o'clock P.M. observer opposite plane polar distance pole positive Quadrant radians radius regular polygon right ascension right spherical triangle right triangle Sect SECTION ship sails sides sin a sin sin² sin²x solution solve the triangle sphere square chains star tan² tangent Trigonometry vertical whence

### Popular passages

Page 64 - The square of any side of a triamjle is equal to the sum of the squares of the other two sides diminished by twice their product into the cosine of the included angle. • SECTION XXXVI LAW OF TANGENTS By Sect. XXXIV, p. 64, a : b = sin A : sin B...

Page 143 - I. The sine of the middle part is equal to the product of the tangents of the adjacent parts. II. The sine of the middle part is equal to the product of the cosines of the opposite parts.

Page 65 - The bisector of an angle of a triangle divides the opposite side into segments proportional to the adjacent sides.

Page 63 - The sides of a triangle are proportional to the sines of the opposite angles.

Page i - If the number is less than 1, make the characteristic of the logarithm negative, and one unit more than the number of zeros between the decimal point and the first significant figure of the given number.

Page 90 - A pole is fixed on the top of a mound, and the angles of elevation of the top and the bottom of the pole are 60° and 30° respectively. Prove that the length of the pole is twice the height of the mound.

Page 116 - X a" = am+". .'. log. (MX N) = m + n — log. M + log. N. Similarly for the product of three or more factors. (5) The logarithm of the quotient of two positive numbers is found by subtracting the logarithm of the divisor from the logarithm of the dividend. (6) The logarithm of a power of a positive number is found by multiplying the logarithm of the number by the exponent of the power. For, N" = (oT)

Page 29 - From the top of a hill the angles of depression of two successive milestones, on a straight level road leading to the hill, are observed to be 5° and 15°.

Page 137 - If, from the vertices of a spherical triangle as poles, arcs of great circles are described, another spherical triangle is formed, called the polar triangle of the first.

Page 180 - Circles are great circles passing through the zenith of an observer, and perpendicular to his horizon. The vertical circle passing through the east and west points of the horizon is called the Prime Vertical ¡ that passing through the north and south points coincides with the celestial meridian.