print("Question no. 21")

quest=str(input("Enter the question number"))

if quest=="a":
    b=int(input("Enter the value of b"))
    h=int(input("Enter the value of h"))
    print(1/3*(b**2*h))
elif quest=="b":
    r=int(input("Enter the value of r"))
    h=int(input("Enter the value of h"))
    print(22/7*r**2*h)
elif quest=="c":
    r=int(input("Enter the value of r "))
    h=int(input("Enter the value of h"))
    print(1/3*22/7*r**2*h)
elif quest=="d":
    x1=int(input("Enter the value of x1"))
    x2 = int(input("Enter the value of x2"))
    y1=int(input("Enter the value of y1"))
    y2= int(input("Enter the value of y2"))
    print(((x2-x1)**2+(y2-y1)**2)**1/2)
elif quest=="e":
    x=int(input("Enter the value of x"))
    h=int(input("Enter the value of h"))
    y=int(input("Enter the value of y"))
    k=int(input("Enter the value of k"))
    r=((x-h)**2+(y-k)**2)**1/2
    print(r)


elif quest=="f":
    b=int(input("Enter the value of b"))
    a=int(input("Enter the value of a"))
    c=int(input("Enter the value of c"))
    x=(-b+(b**2-4*a*c)**1/2)/2*a
    print(x)
elif quest=="g":
    a=int(input("Enter the value a"))
    n=int(input("Enter the value of n"))
    m=int(input("Enter the value of m"))
    d=m+n
    print(a**(d))
elif quest=="h":
    a=int(input("Enter the value of a"))
    n=int(input("Enter the value of n"))
    m=int(input("Enter the value of m"))
    d=m*n
    print(a**d)
elif quest=="i":
    a = int(input("Enter the value of a"))
    m = int(input("Enter the value of m"))
    n = int(input("Enter the value of n"))
    if m>n:
        print(a**(m-n))
    elif n>m:
        print(a**(n-m))
elif quest=="j":
    a=int(input("Enter the value of a"))
    n=int(input("Enter the value of n"))
    d=1/a**n

else :
    exit("Wrong values were input")