## Plane and Spherical Trigonometry in Three Parts |

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angle AOB angle of elevation angle subtended base centre CHAPTER circle circular measure circumference cosec cosine cotangent decimal determine difference equal equation equilateral Example express find the angle Find the distance Find the height find the latitude find the side find the value formula given the Sun's greater haversine haversine formula Hence inches inscribed inscribed circle less than 90 Let ABC mantissa meridian altitude miles negative observed obtain perpendicular plane triangle ABC polar triangle pole polygon positive prove quadrant radius regular polygon required to find respectively right angles right ascension right-angled triangle Royal Naval College ship side BC sine solid angle sphere spherical angle spherical triangle ABC Spherical Trigonometry straight line tabular logarithmic tabular versine tangent tower triangle ABC find triangle ABC let trigono trigonometrical ratios unity vers yards