# Find area of constructed shape on sketch **URL:** \ **Category:** Questions\ **Tags:** sketch\ **Created:** [March 30, 2020, 2:07pm UTC](https://cl.desmos.com/t/find-area-of-constructed-shape-on-sketch/772 "2020-03-30T14:07:30Z")\ **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:** [March 30, 2020, 2:07pm UTC](https://cl.desmos.com/t/find-area-of-constructed-shape-on-sketch/772/1 "2020-03-30T14:07:30Z")
I’m thinking this either can’t be done (yet), can be done with stuff not released, or tough to do. Thought I would ask anyway. So, a student draws a polygon with rotational symmetry on a sketch. They are asked to find the area of the shape they draw. CL checks the area. Here is the activity I am working on, slide [6-1.12 Polygons • Activity by Jeff Holcomb](https://teacher.desmos.com/activitybuilder/custom/5e810a16b3c3e467c367ca4e) ---
**Author:** ![aknauft](https://yyz1.discourse-cdn.com/flex031/user_avatar/cl.desmos.com/aknauft/32/3701_2.png) [@aknauft](https://cl.desmos.com/u/aknauft)\ **Post date:** [April 3, 2020, 5:26am UTC](https://cl.desmos.com/t/find-area-of-constructed-shape-on-sketch/772/2 "2020-04-03T05:26:58Z")
Love that “…” animation while checking work. We can’t (yet!) pull anything out from a geometry component with CL, but if the student clicks on the interior of the polygon and selects “Label”, we will show them the area. As a sketch, I’m pretty confident there _can’t_ be a way to calculate area. There wouldn’t be a good way for the computer to distinguish between strokes being used to form the border of the shape, and strokes being used to fill the interior. With a graph component, you could have them manipulate vertices and then use the shoelace formula (! such a cool formula) to have the graph calculate the area: [Graphing Calculator](https://www.desmos.com/calculator/e0tpjy3q1)