Sine function of an angle θ is defined by the ratio of the length of the side of the triangle opposite to the angle and the length of the hypotenuse in a right triangle. Animate the drawing process of sine wave as shown.

Sine function of an angle θ is defined by the ratio of the length of the side of the triangle opposite to the angle and the length of the hypotenuse in a right triangle. Animate the drawing process of sine wave as shown.