# Python Math: Calculate arc length of an angle

## Python Math: Exercise-7 with Solution

Write a Python program to calculate arc length of an angle.

Note: In a planar geometry, an angle is the figure formed by two rays, called the sides of the angle, sharing a common endpoint, called the vertex of the angle. Angles formed by two rays lie in a plane, but this plane does not have to be a Euclidean plane.

**Sample Solution**:-

**Python Code:**

```
def arclength():
pi=22/7
diameter = float(input('Diameter of circle: '))
angle = float(input('angle measure: '))
if angle >= 360:
print("Angle is not possible")
return
arc_length = (pi*diameter) * (angle/360)
print("Arc Length is: ", arc_length)
arclength()
```

Sample Output:

Diameter of circle: 9 angle measure: 45 Arc Length is: 3.5357142857142856

**Pictorial Presentation:**

**Flowchart:**

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## Python: Tips of the Day

**Merging strings:**

You can use join method to combine strings. Very useful indeed.

lst="Asia, Europe, Africa, Australia" str=",".join(lst) print(str)

Output:

A,s,i,a,,, ,E,u,r,o,p,e,,, ,A,f,r,i,c,a,,, ,A,u,s,t,r,a,l,i,a

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