## Elements of plane trigonometry |

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### Common terms and phrases

acute angle altitude angle of elevation angle opposite angular speed arcsin axes base Check circumscribed circle colog cologarithm common logarithm construct convenient cos2 cosx cotangent decimal point Denote diameter equal equation Example EXERCISES Find the angle Find the area Find the distance Find the length Find the perimeter Find the sides following triangles force formulas geometry given angle given number graph hence horizontal hypotenuse included angle law of cosines law of sines law of tangents LCtn logarithmic computation mantissa negative numerical measure oblique triangles obtuse angle perpendicular plane plane geometry positive Prop Pythagorean theorem quadrant ratios read as printed read co-function result revolutions per minute right triangle rods scale segment side adjacent side opposite sin2 solution subtends subtract tabular difference third side three sides trigonometric functions unit velocity vertex vertical whence