The resources presents a circumference of radius 1, with center in the origin of an orthogonal cartesian system and a point that goes through the curve of the circle. On the side, the construction of the graphic of the sine function is shown, in radians, in the restrict interval in [0,2p], that develops according to the position of the point going through the curve of the circumferenceBasic knowledge of trigonometryEnsino Médio::Matemática