Python math.sqrt() function | Find Square Root in Python
Last Updated :
20 Dec, 2023
sqrt() function returns square root of any number. It is an inbuilt function in Python programming language.
In this article, we will learn more about the Python Program to Find the Square Root.
sqrt() Function
We can calculate square root in Python using the sqrt() function from the math module. In this example, we are calculating the square root of different numbers by using sqrt() function.
Python3
import math
print(math.sqrt(0))
print(math.sqrt(4))
print(math.sqrt(3.5))
|
Output
0.0
2.0
1.8708286933869707
Definition of math.sqrt() Function
sqrt() function in Python is an in-built function, and it is present in the math library.
You can use the sqrt function after importing the math library.
import math
sqrt() function only takes a value greater than or equal to 0.
math.sqrt() Method Syntax
math.sqrt(x)
Parameter
x: is any number such that x>=0
Returns: It returns the square root of the number passed in the parameter.
sqrt() Function Examples
Let’s look at some different uses of math.sqrt() function.
Example 1: Check if Prime or Not
In this example, we are given a number and we are checking if a number is prime or not. Here,run a loop from 2 to sqrt(n) and check if any number in range (2-sqrt(n)) divides n.
Python3
import math
def check(n):
if n == 1:
return False
for x in range(2, (int)(math.sqrt(n))+1):
if n % x == 0:
return False
return True
n = 23
if check(n):
print("prime")
else:
print("not prime")
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Example 2: Finding Hypotenuse Of a Triangle
In this example, we are using sqrt() function to find the hypotenuse of a triangle.
Python3
a = 10
b = 23
import math
c = math.sqrt(a ** 2 + b ** 2)
print( "The value for the hypotenuse would be ", c)
|
Output
The value for the hypotenuse would be 25.079872407968907
sqrt() Function Error
When x<0 it does not execute due to a runtime error. In this example, we can see that we cannot calculate the Python square root if the number is less than zero.
Python3
import math
print(math.sqrt(-1))
|
Output
Traceback (most recent call last):
File "/home/67438f8df14f0e41df1b55c6c21499ef.py", line 8, in
print(math.sqrt(-1))
ValueError: math domain error
This was all about the sqrt() function that is used to find square root in Python. Finding square root in Python is very easy with this in-built function.
For more Math Library Functions : Python Math Module
