'''Question: 
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.
'''

# 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()



'''Output sample: 
Diameter of circle: 9                                                                                         

angle measure: 45                                                                                             

Arc Length is:  3.5357142857142856 

'''