Circumference from Radius (with hint and calculator)

This math topic focuses on calculating the circumference of a circle using the formula \( C = 2\pi r \), where \( r \) is the radius of the circle. Each question provides a different radius and requires the learner to apply this formula to find the circumference. The problems are presented with multiple-choice answers, allowing learners to solve and then select the correct circumference from a list of options. This skill is part of an introductory unit on the geometry of circle circumferences.