link to NCTM circular function animation has moved

the intro to section 2.1 it has the animation from NCTM.  The link must have moved for some reason, so what is in your book doesn't connect at the moment.  But I found it here if you want to update you short link: https://www.nctm.org/Classroom-Resources/Illuminations/Interactives/Investigating-Functions-with-a-Ferris-Wheel-Distance-vs-Height/