import math

r=int(raw_input('Enter the radius of circle:'))

perimeter=2*math.pi*r

print 'Perimeter of a circle :',perimeter

area=math.pi*(r**2)

print 'Area of acircle :',area

x=int(raw_input('Enter the value of x in y=e**x:'))

y=math.e**x

print 'Natural Exponential Function value :',y

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