Exploring Cross Section and Surface of Revolution Intuitively
Math Teachers:
In this resource, we'll learn how to use GeoGebra's Freehand Shape tool
to quickly sketch (to the best of our ability) a cross section of the pottery bowl shown below.
We'll then spin this sketch fully about the xAxis to create a 3D surface of revolution.
After this, we'll open this construction within GeoGebra 3D app on our phones and explore our construction (both cross section AND surface) in Augmented Reality.

![[size=150]Here, we will sketch a cross section of this bowl and rotate it fully about the xAxis. [/size]](https://www.geogebra.org/resource/dhj3e8c6/BdZsKtjgPNJogqkt/material-dhj3e8c6.png)
HOW TO DO IT (in less than 12 minutes)
Here is what the graph in the video looks like.
TO EXPLORE THE RESOURCE ABOVE IN AUGMENTED REALITY:
1) Open up GeoGebra 3D app on your device.
2) Press on the 3 horizontal bars (upper left). Select OPEN or SEARCH.
3) In the search bar, type aavgbgnt
Note these characters are the last 8 characters in the URL to this resource.
4) Get the cross section and bowl in a good view (zoom out if you need to).
5) Press the AR button (lower right) and go from there!