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The Greek small letter (pi) is used in trigonometry as a constant to represent a half-rotation around a circle in radians. The value of is approximately and appears in many math formulas and expressions. Read more…
The capital Greek letter Π (Pi) is used in algebra to represent the product operator. The product operator has three parts: the initial index value, an end value, and the expression being multiplied together.
The greek letter π (pi) is a geometric constant approximately equal to 3.1416. Its value is equal to the length of any circle's circumference divided by its diameter.
The circumference of a circle is given the constant π (pi) multpilied by two times the radius of the circle.
The traditional formula for the area of a circle is given in terms of the geometric constant π (pi).
Radians are a unit that measure angle using the radius of a circle. One radian is equal to the amount of rotation required to travel the length of one radius along the circumference of the circle.