Each group needs:

• personal computers, one per student, with GeoGebra, Microsoft® Excel® and PowerPoint® installed; download GeoGebra (free) mathematics software at https://www.geogebra.org/download
• Activity Pre-Quiz, one per student
• Estimating Volumes Project Rubric, one per student
• CoolingTowerImages.zip (jpg pictures), one per computer (in digital format)
• a camera, such as a cell phone
• a spherical object that can be measured with a vernier caliper, such as a tennis ball, baseball or large marble (see Figure 4); a more complex object like an egg can also be used; alternatively, if no spherical object or no vernier caliper is available, use the provided photograph of a marble sphere (MarbleSphere.jpg) as the practice object
• vernier caliper
• ruler

For the teacher:

• computer with projector and Internet access, to show students photos and two online video animations