Image: Sine curve drawing animation

Description: The relation between the sine curve and the unit circle is illustrated in this animation. As the angle increases, the value of the sine traces the familiar sine curve, in red. Here, the angle in radians is represented by the blue arc around the circle and the blue line, both of which have the exact same length.
Title: Sine curve drawing animation
Credit: Own work
Author: Lucas V. Barbosa
Permission: I, the copyright holder of this work, release this work into the public domain. This applies worldwide. In some countries this may not be legally possible; if so: I grant anyone the right to use this work for any purpose, without any conditions, unless such conditions are required by law.
Usage Terms: Public domain
License: Public domain
Attribution Required?: No