What it means
The sixteenth Greek letter. π is the ratio of a circle's circumference to its diameter, about 3.14159. It also names a policy in reinforcement learning and the prime-counting function. Capital Π is a product of many terms.
Read aloud in real formulas
A = πr²
Aethel says
A equals pi r squared
the area of a circle
∫₋∞^∞ e^(−x²) dx = √π
Aethel says
the integral from negative infinity to infinity of e to the power of negative x squared, d x equals the square root of pi
the Gaussian integral
Typing it
- LaTeX
- \pi, \Pi
- Unicode
- U+03C0, U+03A0
Formulas that use it
Questions
How do you pronounce pi (π)?
It is said “pi”, roughly PIE.
What does π mean in maths?
The sixteenth Greek letter. π is the ratio of a circle's circumference to its diameter, about 3.14159. It also names a policy in reinforcement learning and the prime-counting function. Capital Π is a product of many terms.
How do you type π?
In LaTeX, write \pi, \Pi. Its Unicode code point is U+03C0, U+03A0.