Why does a sine wave speed up and slow down?

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I was playing with the resource linked below, which allows you to see how the value of sine changes as the angle changes. I understand that the hypotenuse side must move faster than the adjacent side shrinks in order for both to reach the y axis at the same time, but I'm pretty much lost from there. Can someone explain slowly and simply why the sine does not change at a consistent speed?

https://www.mathopenref.com/triggraphsine.html