What’s the best size of disposable water bottle? Bottled water is one of the best-selling drinks on Earth. While disposable bottles offer a convenient way to stay hydrated, they also require a lot of plastic that can be harmful to the environment.

In this lesson, students use the volume and surface area of cylinders to compare disposable water bottles and consider environmentally-friendly ways to stay hydrated.

Students will

  • Use the formulas for volume of a cylinder and volume of a sphere to solve real-world problems.
  • Model with geometry.
  • Reason about the surface area of a real-world object. (No formulas required.)

Before you begin

Students will compare and discuss surface areas of cylinders, but they do not need prior experience with these formulas.

Common Core Standards

Content Standards
Mathematical Practices