Python program to calculate arc length of an angle

In this session, we are going to learn how to calculate the arc length of an angle in Python.

Find out the arc length of an angle in python

Arc length:

Arc length is defined as the certain length of a circumference of a given circle.

The formula for the arc length:

```Arc_length = (math.pi*d) * (A/360)
where d= diameter of the circle.
A=angle enterd by the user.```

let’s see coding part of the arc length.

1st import the math package for using PI’s value.

```#import math package to use math.pi for the value of PI
import math
```

create a function which takes the value from the user and perform all operations:

```#create a function to calculate the arc length.
def Arclength():
# take input diameter and angle .
d= float(input("please Enter the diameter of circle: "))
Angle = float(input("please Enter the angle value: "))
# checking for the angle validation
if Angle >= 360:
print("Invalid angle entered ")
return
#calculate  arc length.
Arc_length = (math.pi*d) * (Angle/360)
```

call the function and retrieve all the results.

```    print("the arc Length will be : %.2f" %Arc_length)
#function call
Arclength()
```

Now combine the whole program:

```#python code for finding the arc length of the angle.

##impotr math package to use math.pi for the value of PI
import math
#create a function to calculate the arc length.
def arclength():
# take input diameter and angle .
d= float(input("please Enter the diameter of circle: "))
Angle = float(input("please Enter the angle value: "))
# checking for the angle validation
if Angle >= 360:
print("Invalid angle entered ")
return
#calculate  arc length.
Arc_length = (math.pi*d) * (Angle/360)
print("the arc Length will be : %.2f" %Arc_length)
#function call
arclength()
```

Output:

```please Enter the diameter of circle: 9
please Enter the angle value: 45
the arc Length will be : 3.53```

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