Ideas for a math scavenger hunt?

What are some ideas I can use for the following:

1.) a tool or device used in science that uses geometry and explain how.

2.) an object with rotational symmetry.

3.) a sketch or photo of a building whose design includes at least two of the following: cylinder, a cone, or a prism.

4.) a 2-3 word description of how you use geometry in your profession.

Thanks.