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Which cup to choose?

You are very thirsty - can you use your AR cylinder to decide which cup to choose?

Open GeoGebra 3D Calculator on your smartphone/tablet and search for the applet below using following code: fv9cudpv

Can you use your AR cylinder to estimate the volume of two or more 'real life' cylinders?

To measure the volume of your AR cylinder, select the volume tool Toolbar Image , listed in the 'Measure' section in the tools tab. This will give you a value for volume, but you need to take note of scale in the bottom LHS to convert to a cm3 value! How does this cm3 value compare to manual measurements (with a tape measure)? The formulas below may help The volume of a prism = area of cross section x length Area of a circle =
Image

Construct your own cylinder 'from scratch'

1. Start in the Algebra tab and define a slider 'r'. 2. Move to the tools screen and select the Cylinder tool Toolbar Image. 3. Select (0,0,0) as a base, and any point on the z-axis for height. 4. You will then be asked for a radius, input your 'r' slider. Now you should have a dynamic cylinder!