Engage students with a real-world STEM project where they design a custom baseball cap using circle geometry and measurement.

In this hands-on activity, students measure head circumference, convert measurements into radius and diameter, and apply circle formulas to design a baseball cap sizing system.

Students then take their learning further by creating a cap size chart, calculating fabric area, and completing an engineering design challenge.

This project connects math to real-life applications and encourages creativity, problem-solving, and critical thinking.

Students will:

• Measure real-world circumference using string or tape

• Apply the formula C = 2πr to find radius

• Calculate diameter using d = 2r

• Create a baseball cap size chart

• Apply area of a circle (A = πr²)

• Design a cap using geometric reasoning

• Build a scaled blueprint of a cap opening

• Explain reasoning in real-world context

This resource blends geometry, measurement, and engineering into a meaningful learning experience.

Perfect for:

• Project-based learning (PBL)

• STEM activities

• Geometry units

• Math workshop

• End-of-unit projects

• Enrichment

• Real-world application lessons

A complete structured activity with clear steps is included to guide students through the full design process.