<filename>list_tuple/10.py
from math import pi, exp
consts = (pi, exp)
print("Area of circle is:", consts[0]*int(input("Enter radius of circle: "))**2)
<filename>list_tuple/10.py
from math import pi, exp
consts = (pi, exp)
print("Area of circle is:", consts[0]*int(input("Enter radius of circle: "))**2)