## Plane and spherical trigonometry (Google eBook) |

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### Common terms and phrases

2d quadrant acute angle adapted to logarithmic angle xop base celestial horizon celestial sphere chord circle of latitude Circular Functions circular measure colog complement cos2 cosecant cosine cosqp cotangent ctn A ctn ctn qp deduced denote distance ecliptic equation esc qp Example feet figures find the angle find the functions find the height following angles formulas four-place geometry given angle horizon Hyperbolic Functions hypothenuse increase of qp initial line interpolation IOOO,O less than 180 log ctn log esc logarithmic computation meas miles negative obtained oc"b perp perpendicular Plane Trig positive Prove quad ratios right angle right ascension right triangle sec qp secant sin2 sine and cosine solution solve spherical triangle Spherical Trigonometry straight line substituting tan2 tangent terminal line tions triangle of reference trigonometric functions vernal equinox