Language reference
Pi (the constant π)
Syntax
Pi()
π Pi() * Power(radius, 2) → area (Circles)Description
Pi returns the mathematical constant π (approximately 3.14159), the ratio of a circle's circumference to its diameter. Use it in geometry and anywhere the trigonometric functions appear — they measure angles in radians, and a half turn is Pi() radians.
Technical Description
Pi() → NUMBER. Zero-argument. Returns π as the nearest double (Math.PI, 3.141592653589793). PURE, DETERMINISTIC — the optimizer folds it to a constant, so it evaluates once rather than per row. Not pushed down to a backend: a folded constant already agrees digit for digit, where a backend's own PI() need not.
Examples
Area of a circle from its radius:
π Pi() * Power(radius, 2) → area (Circles)PROJECT Pi() * Power(radius, 2) -> area (Circles)Convert an angle from degrees to radians:
π degrees * Pi() / 180 → radians (Angles)PROJECT degrees * Pi() / 180 -> radians (Angles)Radians to degrees:
π radians * 180 / Pi() → degrees (Angles)PROJECT radians * 180 / Pi() -> degrees (Angles)Limitations
Returns the nearest double, not an exact value — no decimal constant can hold π. Zero-argument: Pi without parentheses is a column reference, not a call.
Alternatives
Write the literal 3.14159 where a rough value will do; Pi() is the full-precision constant and reads as intent.
See Also
Notes
Relix trigonometry is in radians: Sin(Pi() / 2) is 1, and Pi() radians is a half turn.