# Help with initializing the location of the moveable point **URL:** \ **Category:** Questions\ **Created:** [February 21, 2024, 4:19pm UTC](https://cl.desmos.com/t/help-with-initializing-the-location-of-the-moveable-point/5378 "2024-02-21T16:19:06Z")\ **Posts on this page:** 2\ **Page:** 1
**Author:** ![Jeff\_Holcomb](https://yyz1.discourse-cdn.com/flex031/user_avatar/cl.desmos.com/jeff_holcomb/32/433_2.png) [@Jeff\_Holcomb](https://cl.desmos.com/u/Jeff_Holcomb)\ **Post date:** [February 21, 2024, 4:19pm UTC](https://cl.desmos.com/t/help-with-initializing-the-location-of-the-moveable-point/5378/1 "2024-02-21T16:19:06Z")
I am working on an activity to develop fluency with the unit circle-- aiming to get them to think about arc length. I want to set the information for the problem in a table on the slide that will be hidden. I am struggling with figuring out how to initialize the moveable point. Any help would be great. @Daniel_Wekselgreene @Daniel_Grubbs > **[Initialize Help • Activity Builder by Desmos](https://teacher.desmos.com/activitybuilder/custom/65d620943a028319cfca2215)** > > by jholcomb ---
**Author:** ![Daniel\_Grubbs](https://yyz1.discourse-cdn.com/flex031/user_avatar/cl.desmos.com/daniel_grubbs/32/719_2.png) [@Daniel\_Grubbs](https://cl.desmos.com/u/Daniel_Grubbs)\ **Post date:** [February 21, 2024, 5:55pm UTC](https://cl.desmos.com/t/help-with-initializing-the-location-of-the-moveable-point/5378/2 "2024-02-21T17:55:29Z")
It appears that any extra calculation within your trig function nixes draggability, but if you use a single variable it will work, so just remove the 2pi in favor of specifying a in radians… > **[Desmos | Graphing Calculator](https://www.desmos.com/calculator/05nybyonp5)** > > Explore math with our beautiful, free online graphing calculator. Graph functions, plot points, visualize algebraic equations, add sliders, animate graphs, and more.