pi

Ratio of circle's circumference to its diameter

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Syntax

p = pi

Description

example

p = pi returns the floating-point number nearest to the value of π in IEEE® double-precision. For more information on floating-point numbers, see Floating-Point Numbers.

Examples

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Open Live Script

Return the value of π in double precision, which has 15 digits after the decimal point.

format long
p = pi
p = 
   3.141592653589793
Open Live Script

Calculate the area of a circle with radius 7.

r = 7;
A = pi*r^2
A = 153.9380
Open Live Script

Calculate the surface area and volume of a sphere with radius 5.

r = 5;
SA = 4*pi*r^2
SA = 314.1593

V = 4/3*pi*r^3
V = 523.5988

Extended Capabilities

C/C++ Code Generation
Generate C and C++ code using MATLAB® Coder™.

See Also

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Topics

Introduced before R2006a

MATLAB Documentation

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