KnowraUnit circleLinked fromLinked fromThe 22 pages that link to Unit circle, each with the reason it gives.All 22Broader topic 4Related 13Narrower topic 4Compared with 1Inverse trigonometric functionsNarrower topic: Its coordinates and angle conventions define the ratios these functions invert.TangentNarrower topic: Its coordinates make tangent the ratio of vertical to horizontal position.Trigonometric identityNarrower topic: It gives geometric meaning to sine and cosine beyond acute triangle angles.F. and M. Riesz theoremNarrower topic: It is the domain on which the measure and its Fourier coefficients are defined.