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View the first million digits of pi (π) on one page. Learn about pi, its history, and how to calculate the circumference of a circle using pi.
Pi is the ratio of a circle's circumference to its diameter, approximately equal to 3.14159. It is an irrational and transcendental number with many applications in mathematics and physics. Learn about its history, approximations, symbol, and more.
Pi (π) is the ratio of the circumference to the diameter of a circle, and it has no pattern in its decimal expansion. Learn how to find pi yourself, use it to calculate the circumference and diameter of circles, and celebrate Pi Day on March 14.
The number \(\pi\) plays a key role in their analysis, as this complex number is equivalent to \[re^{i\theta}=r(\cos\theta + i\sin\theta)\] as both sides represent the same point in the complex plane. Setting \(\theta = \pi\) gives the famous identity \[e^{i\pi} + 1 = 0.\]
21 paź 2024 · Pi is the ratio of the circumference of a circle to its diameter, and its symbol is π. Learn about the history, value, uses, and calculations of pi from Britannica's editors.
Pi (π) is the ratio of the circumference of a circle to its diameter, an irrational number that can be approximated by 3.14. Learn how pi is used in equations for the area, volume and surface area of circles, spheres, cylinders and cones.
Pi (π) is a mathematical constant that is the ratio of a circle's circumference to its diameter. Learn how to calculate Pi (π) using different methods, and explore its applications in mathematics, physics and engineering.
