Python | cmath.pi constant

With the help of cmath.pi constant, we can use this constant value in the calculation of area of circle, perimeter of circle and etc.

Syntax : cmath.pi
Return : Return the pi value.

Example #1 :
In this example we can see that by using cmath.pi constant, we are able to drive the mathematical formulas very easily.

# importing cmath library
import cmath

r = 5
# using cmath.pi constant
gfg = cmath.pi * r*r

print(gfg)

Output :

78.53981633974483

Example #2 :

# importing cmath library
import cmath

r = 3
# using cmath.pi constant
gfg = 2 * cmath.pi * r

print(gfg)

Output :

18.84955592153876