Celebrate Pi Day with the Classic Formula π = C/d #3249995 (License: Personal Use)

This clean, educational illustration highlights the mathematical constant π as the ratio of a circle’s circumference (C) to its diameter (d). Arrows and labels clearly indicate the measured parts of the circle, reinforcing core geometry concepts. Ideal for classroom handouts or digital learning modules.

Used in educational websites, math blogs, and school resources during Pi Day (March 14) to teach or reinforce the definition of pi; matches user intent for learning, teaching, or sharing math content.