Plane Trigonometry

acute angle altitude angle of elevation antilog apothem chord circle colog cologarithm computed cos x cos² cosecant cosine cot² cotangent Cotg csc² decimal diagonal Durell's examples Exercise figure Find antilog Find log find the angle Find the area Find the distance Find the numerical Find the side Find the value five-place tables formula four-place tables geometry given angle given number Hence history of trigonometry horizontal plane hypotenuse isosceles triangle law of sines Let the pupil log cot loga logarithms mantissa method numerical value oblique triangles obtained parallelogram Plane Trigonometry Prove radians radius Regiomontanus right triangle sec² secant secx Similarly sin² sin³ sine solution spherical trigonometry subtends Subtract tan x tan-¹ tan² Tang tangent tower triangle ABC trigonometric functions π π